3.5" Exhaust for 2018 Tahoe 6.2L?

[gtrslngrchris]

You guys are way overstating the "problem" of 3" aftermarket exhausts. A 3" system is likely to actually improve the power curve for the way most people drive these anyway as a larger system might actually lose you some torque in the middle of the power curve where you don't want to. If you don't at least have a whipple or similar on your 6.2L then I think you are kidding yourself about exhaust and the effect of larger pipe.

As far as Duramax's go I've personally seen more than one "sleeper" LB7/LBZ Duramax making well over 500whp on the factory 3" exhausts (I really think 600whp+ but I'm being conservative). My LB7 with a built trans and upgraded turbo stood no chance even with my giant 5" exhaust.

 

[homesick]

Some of y'all might benefit from watching 'Engine Masters' on Motor Trend TV. They do dyno comparison testing, in-depth and technical.

joe

 

[Thrust]

I would worry about your flat section in the y pipe first.

 

[J5races]

I would worry about your flat section in the y pipe first.

Did you replace yours with something larger and get a worthwhile gain from that?

 

[swathdiver]

Whipple claims the Gen V kit makes 535hp to the wheels. I gotta think bigger exhaust piping will help at that power level.

Maybe so, there's a math formula for that but I don't remember it anymore. Banks and Hennessey are on top of that, I'd ask them.

 

[Joseph Garcia]

As stated above, bigger diameter exhaust piping is NOT automatically better. There is an actual 'tune' of exhaust fumes air flow, volume and velocity, involved in exhaust system engineering. With too little piping diameter, you get restricted flow due too much exhaust fumes trying to flow through the piping, with a resulting back pressure and a slowdown in exhaust fume velocity through the piping. With too much piping diameter, you lose the exhaust fume velocity momentum achieved from from the exhaust manifold/headers, and you get velocity dead spaces in the downstream piping, with a resulting slowdown in exhaust fume velocity through the piping.