Torque loss with no cats and 1.75 headers?

[SmokinV10]

Is it true that you may lose torque with the installation of headers with 1.75" primaries? Also, do you lose addional torque with cat removal?

 

[MadMaxx]

What other mods? Big HP requires big breathing.
If I was to run a large primary, I would put a muffler on the car to create back pressure, unless your going to dump it on the side of the car (in which case, it doesn't matter).

MM

 

[SmokinV10]

1.75 inch primaries on TNT headers, no cats, 3" corsa

 

[Kurt 97 GTS]

Just showing my ignorance, but I thought the Belanger's were 1.75 inch. Is the primary different? I've read that 1 5/8 are good for mild mod cars. Thanks for the education....Kurt

 

[PETSN8K]

I'm not really sure what size the Belangers are. My guess would be either 1 5/8 or 1 3/4, but definitely not 1 7/8 (probably 1 5/8). 1 7/8 headers would definitely be overkill on a stock motor. If you're planning on supercharging or diving into the motor, the larger pipes will be taken full advantage of and produce higher numbers.

 

[PETSN8K]

Yeah, I believe it's true you'll lose some low end torque with the larger pipes ON A STOCK ENGINE. The 1.75's are meant to be used on a SERIOUSLY modded car. The more power your motor is generating the more power you'll gain from the larger pipes. That is why on a stock engine smaller pipes like Belanger seem to out perform larger pipes such as TNT, CDI, HMS, etc. But as you increase the power output on the motor the larger pipes should be good for 10 to 20 additional hp over the smaller pipes.

 

[varanus]

smokin . . . .keep in mind that you will be putting on a roe sc which must have lots of breathing. So while it may not give you a gain right now, it will pay off in late aug or sept when they get here. Otherwise smaller headers will decrease your hp (other words . . .I'll be faster than you!