I ran a 2.5" Flowmaster catback system on my former 90 ZR-1. It dynoed at 422rwhp so that was probably close to 500 at the flywheel. The guy I sold it to installed a 3" B&B Triflo on the car. Result? It picked up 6hp but also gained a ton of unwanted resonance that took away a lot of the enjoyment of driving the car. I'm not sure that was a good trade-off. Getting back to your combo,is the exhaust system you plan to run comprised of all-mandrel bends? If not,installing a 2.5" mandrel bent system will flow as much as a non-mandrel 3". Just something to keep in mind. However,if you do decide to run the bigger system,may I offer a suggestion? Run full tailpipes,preferrably in 2.5". You will see a noticeable torque increase by doing so. Clint Hooper H&H Custom,owner LT5 Registry Director http://www.LT5Registry.net/ ACES #1650 http://dalesplace.com/misc/friends/clint_hooper.htm ----- Original Message ----- From: "65ss.com" <[EMAIL PROTECTED]>
> Well, I'm actually planning on building a 383 for the car in the next year > with Aluminum Heads, Roller cam, etc... So that's why I figured I'd go 3" > now, and save time/money in the long run. Do you think 3" would be too much > for a 425hp+ 383? > > > > > Ok,I'll say it,then. 3" is too big for that engine. Why do you need > anything > > larger than 2.5"? > > Clint Hooper > > H&H Custom,owner > > LT5 Registry Director > > http://www.LT5Registry.net/ > > ACES #1650 > > http://dalesplace.com/misc/friends/clint_hooper.htm > > ----- Original Message ----- > > From: "tom" <[EMAIL PROTECTED]> > > > > > > > First, the three inch exhaust may be a little overkill for the engine, > but > > > it probably can't hurt if you like it. > > > Tom Tomlinson > > > '71 Malibu > > > '66 El Camino > > > > >
