treynor
Enthusiast
Months and months ago, I proposed creating a "BPU" list for the Gen II Viper (that's Basic Performance Upgrades, btw). I believe I am now ready to create that list. Comments / questions / corrections welcome.
All figures plus/minus 5 unless otherwise noted. Power levels from cars with >10,000 miles may be 5-10 higher at each mod level due to lower internal friction. All prices quoted minus labor, as labor cost varies tremendously by area.
Stock Gen II car: 405 RWHP, 440 ft/lbs
Add filters & smooth tubes: $100-$200, 415 RWHP, 445 ft/lbs
Add catback 3" exhaust: $600 - $1500, 420 RWHP, 450 ft/lbs
Add high-flow 3" cats: $350 - $600, 425 RWHP, 455 ft/lbs
Add AL flywheel: $500, no dyno-visible gains but substantial power increase in 1st & 2nd gear.
Add headers: $1500 - $3200, 445 RWHP (435 RWHP for '00+ cars), 485 ft/lbs
Add T&D roller rockers: $1200, 460 RWHP (450 for '00+ cars, duration helps especially here), 490 ft/lbs
Add tuner heads: $3500 - $5500 (and up), 490 - 520 RWHP, 500 - 530 ft/lbs
Add ported / honed intake: $800+, 500 - 540 RWHP, 500-530 ft/lbs
This is about the limit of what I'd call "basic" upgrades. If you still want more, you can go four main routes:
1) Bored/stroked motor -- several tuners offer packages making 560 - 620 RWHP / 560 - 600 ft/lbs. $15,000 and up.
2) NOS -- this can actually be done without any of the above mods, although they work synergistically. Offered by several tuners. $1200 - $2,500, adds 100-200+ RWHP, may blow up your engine if you do something wrong
3) Supercharging -- several tuners offer packages making 550 - 1000 RWHP. $12,000 and up
4) Turbocharging -- one tuner I'm aware of offers a twin-turbo package making 750+ RWHP. $55,000
All figures plus/minus 5 unless otherwise noted. Power levels from cars with >10,000 miles may be 5-10 higher at each mod level due to lower internal friction. All prices quoted minus labor, as labor cost varies tremendously by area.
Stock Gen II car: 405 RWHP, 440 ft/lbs
Add filters & smooth tubes: $100-$200, 415 RWHP, 445 ft/lbs
Add catback 3" exhaust: $600 - $1500, 420 RWHP, 450 ft/lbs
Add high-flow 3" cats: $350 - $600, 425 RWHP, 455 ft/lbs
Add AL flywheel: $500, no dyno-visible gains but substantial power increase in 1st & 2nd gear.
Add headers: $1500 - $3200, 445 RWHP (435 RWHP for '00+ cars), 485 ft/lbs
Add T&D roller rockers: $1200, 460 RWHP (450 for '00+ cars, duration helps especially here), 490 ft/lbs
Add tuner heads: $3500 - $5500 (and up), 490 - 520 RWHP, 500 - 530 ft/lbs
Add ported / honed intake: $800+, 500 - 540 RWHP, 500-530 ft/lbs
This is about the limit of what I'd call "basic" upgrades. If you still want more, you can go four main routes:
1) Bored/stroked motor -- several tuners offer packages making 560 - 620 RWHP / 560 - 600 ft/lbs. $15,000 and up.
2) NOS -- this can actually be done without any of the above mods, although they work synergistically. Offered by several tuners. $1200 - $2,500, adds 100-200+ RWHP, may blow up your engine if you do something wrong
3) Supercharging -- several tuners offer packages making 550 - 1000 RWHP. $12,000 and up
4) Turbocharging -- one tuner I'm aware of offers a twin-turbo package making 750+ RWHP. $55,000