true dual straights on 350 vortec

[civicdestroyer98]

I have a 97 ecsb 4x4 that has true dual glass packs on it. Wasn't loud enough so I took the cats out and I still want it louder (I'm 16) so I want this thing to be a real head turner in the small town I live in. it runs fine right now and no engine light so far. But I want to know if anyone else has ran straights without cats and how it ran, performance, mileage etc...
Thanks for any info or thoughts I'd really appreciate it

 

[SwampHound]

I have a 97 ecsb 4x4 that has true dual glass packs on it. Wasn't loud enough so I took the cats out and I still want it louder (I'm 16) so I want this thing to be a real head turner in the small town I live in. it runs fine right now and no engine light so far. But I want to know if anyone else has ran straights without cats and how it ran, performance, mileage etc...
Thanks for any info or thoughts I'd really appreciate it

Tons of people do. Unless the cats were deleted via tune or the o2 sensors are dummied out you should be getting a code for poor catalytic performance.
Some people think straights add more power and some swear they get better mileage. No numbers to back it up though.

 

[civicdestroyer98]

Thanks for the reply! I have dummy sensors so the cel doesn't come on. I think I'm going to throw some straights on it then

 

[TylerZ281500]

straights rob power put a x or h pipe in there, if you want a good flowing loud exhuast borla xr1, slp lm2's or delta 40s or the knockoff dynamouths and such.

 

[98_k1500]

I got dual 3" straights dumped over the axle. Loving every minute of them. They are not too awful loud. They don't have that raspy pop to them that is common with smaller straights.

 

[SwampHound]

I got dual 3" straights dumped over the axle. Loving every minute of them. They are not too awful loud. They don't have that raspy pop to them that is common with smaller straights.

Heard of back pressure issues when running true 3" duals on the 350. You had any?

 

[98_k1500]

not that i know of. they are factory 3" down pipes and have the converter hulls still in them. Idk where the backpressue myths are rooted, but less is better IMO, The engine having to push the exhaust out is taking ponies from reaching my wheels. IDK why folks think you need it for it to run correctly.

 

[SwampHound]

not that i know of. they are factory 3" down pipes and have the converter hulls still in them. Idk where the backpressue myths are rooted, but less is better IMO, The engine having to push the exhaust out is taking ponies from reaching my wheels. IDK why folks think you need it for it to run correctly.

I've just read that it affects different parts of the power band. Something to the effect of needing some BP at low RPMs but little to none at high.

 

[TylerZ281500]

bp and scavenger come into affect more so yes its doable on a vortec aon a tbi itll be pissed off with that combo

 

[civicdestroyer98]

Would I burn my valves over time?