V10SpeedLuvr
Enthusiast
I have rear exit exhaust, but if you want to hear my setup of Borla headers, Moroso spiral flow mufflers in place of OEM cats, and rear muffler delete setup, give me a call/text and I'll come by
So I pulled the cats and my car now sounds like crap, what should I do
- Thread starter darkostoj
- Start date
I have rear exit exhaust, but if you want to hear my setup of Borla headers, Moroso spiral flow mufflers in place of OEM cats, and rear muffler delete setup, give me a call/text and I'll come by
I guess that the Hi-flows could be used as mufflers, although they were never designed for that purpose ...
Even when I gutted the cats on the wife's new Hemi pickup my intention was to decrease the resistance to the engine's outflow. It did sound a little bit more throaty, but I think I got 1 mpg increase (which would also mean a hp increase).
In case anyone thinks that restricting the exhaust adds power - not true! Headers gain power and that is obvious from the increased noise. Kind of like choking yourself, choking the exhuast hurts performance and mileage.
Ted
Rizzo
Enthusiast
I had high flows on with a Borla cat back on my GTS and when I took the cats off it sounded much better. Performance was the same, no codes, and WAY cooler side sills. I can idle around town on a hot day and get out and hold my hand on the side sill and its warm but never too hot to touch. Before I took the cats off it was way too hot to touch. I would never have cats again on a GEN 2.
dave6666
Enthusiast
Have Cherry Bombs climbed the food chain since they were the standard for redneck pickup truck mods in the 70's?
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I'm not so sure about that... Maybe someone with a little more knowledge than both of us, can comment.. I have always been told on certain cars, at certain HP levels,with smog equipt., that some backpressure is be a good thing....
Now if were talking about a ProStreet car, with no PCM, No smog, different story. But were talking about a 2001 car with a PCM, smog,etc,etc. The car is NOT intended to run with no cats.
All I can go by is my real world experience. And honestly, I dont have any before and after dyno numbers to back this up. What I can tell you is, my 2001 did NOT like having Cat Delete.. Not 1 bit.
It very well could benefit a car more with mods (such as yours). My car was bone stock. who knows.
mjorgensen Woodhouse
Enthusiast
Every car that has come through here that we dyno'ed without cats had less power in the midrange whether it was torque or HP. They did make more on the VERY top end but sacrificed to much in the sweet spot for our/my taste. My last race car I did extensive back to back testing and it was always faster with a cat than without. FWIW
AHudson777
Enthusiast
Mine is a basically stock Gen 2 GTS. I had the roasting sills problem, and didn't love the exhaust note.
I put on the high flow stainless from JonB, running through stock exhaust thereafter. JonB, who's customer service is near legendary, had the guy who makes the cats get on a conference call with me since I'm a freak about exhaust noise. Told me exactly what to expect, gave me confidence in the choice.
Results - -
Side sills are cooler but too hot to touch at the 'bend' in the pipe area. Far better at passenger space. In fact, this area is a 'non concern' now.
Exhaust note SLIGHTLY louder, deeper. I much prefer both outcomes since I hate 'loud'. Car feels quicker, but that's a mental measurement only. The exhaust noise is very pleasant, no drone of course, and sounds like a performance car.
I put on the high flow stainless from JonB, running through stock exhaust thereafter. JonB, who's customer service is near legendary, had the guy who makes the cats get on a conference call with me since I'm a freak about exhaust noise. Told me exactly what to expect, gave me confidence in the choice.
Results - -
Side sills are cooler but too hot to touch at the 'bend' in the pipe area. Far better at passenger space. In fact, this area is a 'non concern' now.
Exhaust note SLIGHTLY louder, deeper. I much prefer both outcomes since I hate 'loud'. Car feels quicker, but that's a mental measurement only. The exhaust noise is very pleasant, no drone of course, and sounds like a performance car.
Alexarz
Enthusiast
I find it extremely hard to believe that catalytic converters add power. Mine were replaced by cherry bombs and a Corsa 3" and it definitely made the car more responsive and harder pulling. The sound is much better; not loud but much more suitable for a performance car. This is on a GTS, by the way.
NO ! SidePipe cars that are catless are very backfire-poppy / ratty sounding to most adult ears. HF Cats can have a body as short as 8"....they can be combined with any number of cheap-o glasspacks and they sound pretty good ...certainly better than Gen1 Stock: YUCK!
And, no cats = 8 litres of STINK come out 22" from your hair and clothes. Peee-Yeeewww.
eucharistos
Enthusiast
hey....
JonB just said Peee-Yeeewww
JonB just said Peee-Yeeewww
Alexarz
Enthusiast
hey....
JonB just said Peee-Yeeewww
Are you calling him ***?
well guys i'm gonna order some 2.5" high flow cats.
I did a lot of searching and found someone on the sight that went through the exact same experience as me..there is something about the corsa 3" and a cat delete that just sounds and drones terribly...after his trial and error with different setups he finally got a real nice setup and told me about it. Instead of spending close to $300 on high flow cats I'm gonna get these 2.5" ebay units and run em for under $40 each. He said they made the car sound perfect.
Thunderbolt High Flow universal Catalytic Converter 2.5:eBay Motors (item 370205262107 end time Sep-19-09 08:11:26 PDT)
I did a lot of searching and found someone on the sight that went through the exact same experience as me..there is something about the corsa 3" and a cat delete that just sounds and drones terribly...after his trial and error with different setups he finally got a real nice setup and told me about it. Instead of spending close to $300 on high flow cats I'm gonna get these 2.5" ebay units and run em for under $40 each. He said they made the car sound perfect.
Thunderbolt High Flow universal Catalytic Converter 2.5:eBay Motors (item 370205262107 end time Sep-19-09 08:11:26 PDT)
eucharistos
Enthusiast
wow those are cheap
pls post up your impressions of them once you get them
pls post up your impressions of them once you get them
VPRVENM97
Enthusiast
I second this route. It's exactly what my vipertech did and it sounds great. If you still have your stock cats it won't cost you anything except labor. Sounds great, much better then with stock cats, no drone and passes the strict CA smog sniffer test. I have headers and Corsa catback.
the person that told me about them on here loved them. I just ordered a set and will keep everyone updated on how they do.
Dude, Proven aftermarket hi-flow cats are available for about 300bucks for the PAIR from some of our vendors such as PArtsRack & ROERacing. Do you know howmuch stock cats cost? About 500-600 a piece
These hi-flow cats that we use are a bargain. why even consider buying a tincan off ebay???
your situation is ameture night. goodluck with whatever you do though
EllowViper
Enthusiast
That would be me. Have had them on for several years now with zero issues..even with the blower and headers on. FYI these are rebadged by others under their $$$$ brand name...as I'm sure other do as well. VCA members 'round here know how my car sounds.
Dude, Proven aftermarket hi-flow cats are available for about 300bucks for the PAIR from some of our vendors such as PArtsRack & ROERacing. Do you know howmuch stock cats cost? About 500-600 a piece
These hi-flow cats that we use are a bargain. why even consider buying a tincan off ebay???
your situation is ameture night. goodluck with whatever you do though
just because you don't buy from a vendor makes something not good. These are proven to sound good and be a nice product, so why the hell not buy them!? I prefer not to throw around money if you don't need to.
btw...try using spellcheck...thanks
thanks again for the info! I ordered the set and can't wait to get them on!
Is there a reason for 2.5" instead of the 3"?
i'm using stock exhaust manifolds that is 2.5", and the inlet to the corsa 3" exhaust is 2.5" at the resonator
eucharistos
Enthusiast
hey EV
got to tell ya i miss the boy in your old avatar, he looked so cool standing there
eucharistos
Enthusiast
Possibly because they do nothing and are simply a steel pipe with a dumby honeycomb containing No catalyst wich might explain why they are cheaper then a pair of kmart shoes.
do elaborate...
EllowViper
Enthusiast
I've "E" mailed the company President to ask about "brand naming" and how his products compare to those of Random Tech, Dynamax, Magnaflow, etcetera. Here is the link:
Canammex Exhaust - Catalytic Converters, Mufflers
Some of the Vette/Mustang/other forums made some linkage to Magnaflow spun cats but that info may/may not be accurate. I thought several years ago I had a link to some aftermarket user of these cats. Oh well. I'll retract my brand naming assertion...for now...until I hear back from the company (if they will disclose that to some smuck in Florida!). For what its worth, I have yet to find a post on the other forums indicating anything but positive reviews of these products.
Canammex Exhaust - Catalytic Converters, Mufflers
Some of the Vette/Mustang/other forums made some linkage to Magnaflow spun cats but that info may/may not be accurate. I thought several years ago I had a link to some aftermarket user of these cats. Oh well. I'll retract my brand naming assertion...for now...until I hear back from the company (if they will disclose that to some smuck in Florida!). For what its worth, I have yet to find a post on the other forums indicating anything but positive reviews of these products.
I just got mine done today and it sounds great with corsa 3' and without cats
however my guy did do some neat work covering it up with some material (fiberglass I think) to keep the fumes and heat to minimum in the cabin. Sounds great at idle, great when crusing and screams when you nail it. There is no popping noise on decel and not much drone either. It pulls quicker as well or feels like it, i guess it's an individuals preference when it comes to exhaust.eucharistos
Enthusiast
My 95 I just pulled the cats, ran stock mufflers and the car was pretty quiet still. Sounded better than before but still wanted more noise. If I hadn't gotten rid of the car I would have swapped mufflers.
My 93 has no cats and magnaflow mufflers. Sounds sweet at idle but I don't like the sound much when on the gas. Extremely loud in a more race car sound to it. Doesn't appear that the magnaflows are doing much so HP is probably improved.
97 has 02 headers, no cats, and borla 3" exhaust and definitly isn't too loud. I was suppriesed how quiet it is compared to my brothers but IDK, sounds good IMO.
