Yet another pipe diameter Q

[Chart505]

OK, I have the 2.5 MSA exhaust but bought have a vintage ANSA rear muffler. I'd like to use that one but the inlet is 2 inch. Motor has headers, bigger air flow meter but otherwise stock. Going down from 2.5 to 2 inch- is that big deal?

[Zedyone_kenobi]

Absolutely not.

Do not overestimate how much air you actually need for a mostly stock Z car. I am currently running an MSA header with a 2.5" outlet, that stays 2.5" all the way until the rear suspension, then necks down to 2.0" so it can go to my ANSA. I can promise you, I would not pick up any power at all from replacing my 3 feet of 2.0" pipe with 2.5" pipe.

By the time the gas reaches the rear of the car, the gas has cooled significantly, and thus has a lower volume given the same mass than when it comes out of the cylinder. So going to a smaller tubing toward the rear of the car would probably actually help keep the velocity of the gas up without effecting back pressure.

[Chart505]

How loud do you think the ANSA muffler is going to be compared to the MSA Magnaflow? I dont have the center muffler for the ANSA, just the rear.

[Zedyone_kenobi]

hmm, not sure, but I had a turbo style muffler with my 2.5" all the way back and my MSA header, and it was louder than my ANSA with a resonator at cruise. But at full open the ANSA just wails like an old Ferrari

[TexasRider260Z]

The ZedOne sounds GGOOOODDD!

[Zedyone_kenobi]

THanks!