Flow numbers on stock muffler?

[Bman05Ltd]

Hi folks,

I searched and didn't find anything, so I'm sorry if this is a repeat.

Does anyone have flow numbers on the stock muffler? Is the turbo muffler the same as N/A? I'm most interested in the backpressure at 270 cfm, but I can work back from the more standard 25/28" H2O readings.

Thanks!
Bman

[Mean Green]

The muffler on the turbo is a free flow design because turbo cars hate a restrictive exhaust.

[Bman05Ltd]

Hmmm. By "free flow design" does that mean different tube diameter? Different construction (fewer baffles, more direct routing through the muffler...)? Might anyone have flow numbers for this unique GT (turbo) muffler?

I'd also suggest that ALL cars / engines hate a restrictive exhaust, all "backpressure" misnomers to the contrary.

Thanks,
Bman

[Mean Green]

Originally Posted by Bman05Ltd

Hmmm. By "free flow design" does that mean different tube diameter? Different construction (fewer baffles, more direct routing through the muffler...)? Might anyone have flow numbers for this unique GT (turbo) muffler?

I'd also suggest that ALL cars / engines hate a restrictive exhaust, all "backpressure" misnomers to the contrary.

Thanks,
Bman

For turbo cars the muffler has no chambers at all. Nothing to impede flow. Non turbo cars need "backpressure" They can actually lose power without it. As an example I have a SRT-4 which basically has the same turbo'd engine as the PT GT. The SRT-4 comes stock without a muffler, just two 12" resonators. Sorry, I don't have any numbers for the GT muffler. I did put the GT muffler off of my PT turbo, when I went to a larger (2 1/2" catback exhaust), on my wife's '01 PT. While there was no performance gain the sound was a nice low rumble and not loud at all.

[Bman05Ltd]

Thanks for the clarification.

Bman