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and when I get my Z soon Ill be going with a full 3" open system all the way back. Ill prove it to them (with back to back dynos) how stupid a 2.5" exhaust really is. Backpressure eats horsepower. The more air you flow through the engine the more you need to exit it. Now, the other thing, I dont think you gained a full second off of exhaust alone. Seems a bit much to me. Realworld data for you. My friend dropped .2 off his times going from 7psi of backpressure (way too much) to 2psi changing exhaust from 2.5" to 3" on a truck. .2 seconds is a great improvement. His truck is supercharged so he knows about airflow and compressed air too. Also, to note, with 2.5" piping the Z is cramming more excessively hot air into the exhaust pipe, and heating it up further. This affects underhood temps as well as further expanding the air, creating even more backpressure. All in all, the bigger the turbos and the bigger the boost, the bigger exhaust you will need. I firmly believe some people on this forum dont have a clue as to what they are talking about when it comes to exhaust. I would like to see someone with GT2350 turbos and 2.5" exhaust, do a dyno run, swap to 3" and do another run. I bet they will see the difference then. Everybody will suddenly realize that 3" is better...or is it? It really depends on your setup, not all exhaust works for everyone. You need an exhaust to suit the motors CFM capabilities at its current state of tune. 0.02 Eric L.
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