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10-02-2013, 09:20 PM #1
- Join Date
- Oct 2007
- Ellijay, GA
Are straight pipes bad for my engine?
I'm trying to choose an exhaust system for my 1999 'Burb. I've got the 5.7, stock exhaust, and I've watched a few YouTube videos where guys have gone with straight pipes right from the catalytic converter. I like the sound, and I live in the middle of nowhere so local ordinances aren't a problem. My question is whether it hurts my engine performance at all. Input?
10-02-2013, 11:02 PM #2
there is no "harm" to your engine when you let it breathe with less restriction, but.....
if you look at multiple threads across the internet, when straightpiping, there is a "minimal" loss in back pressure, and having back pressure is better suited for more low-end torque. aside from that.... everything is great about it, and even better when properly tuned...2000 Chevrolet Silverado
4.3L V6, 4L60E, 2WD, Single Cab
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10-03-2013, 11:22 AM #3
- Join Date
- Dec 2011
- Blog Entries
Sadly the 1996-1999 Tahoe and Burb have no tuners available that can help with those kinds of upgrades, but if your keeping the cats that should have enough back pressure for the engine, if it isn't then there's tons of kits to add some back pressure.
1996 Chevy Tahoe LT 5.7L V8 4X4 202,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.
Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door
10-03-2013, 12:11 PM #4
another thing to do with straight pipes is to add an X pipe (or H pipe) just to help equalize pressure.David
2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
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10-04-2013, 09:05 AM #5
- Join Date
- Sep 2013
- Amberg, WI
Downsize the pipe by one size. I owned a 83 K5 Blazer with a transplanted 454. I had no cat and was straight piped from headers to 3" sidepipes. Sounded great but my low end torque suffered. Going to a 2 1/2" rear exit with an equalizer pipe helped greatly and still sounded good. For torque (seat of your pants feel) you must have more back pressure than the cat.