Porsche 924S Thrush exhaust project

Description

87 Porsche 924S 2.5L Tried a Thrush welded muffler to see how it sounded. It was pretty good but a little too loud and raspy. I got a thrush glasspack to add in as a pre-muffler hoping that would quiet it down a bit and it just sounded terrible...even louder and really raw and ricer. Not too bad when paired with the stock muffler but that rasp is still there and kind of nasty. It has since diminished a bit after being run in. Running a Lindsey 944MAX chip, hence the 7000 rpm shift points. I don't run it that high all the time as the stock valvetrain doesn't keep up with it that well past ~6700-6800, but it does make useable power up there over the stock tuning, esp with an open exhaust. I don't know where I'll take it from here...maybe a Flowmaster 60 would sound better and I may have to pair it up with a high flow cat to block out some of the rasp and be somewhat emissions legal while still agreeing with the chip tuning. The flowmaster style baffling definitely has the potential to sound awesome on this motor...but it's a 2.5L inline 4 cyl and makes alot of sound to quiet down. I used all stock piping with the old muffler cut off and the 2 1/4" Thrush fitted in place. The stock pipe size is metric, ~2 1/8". The inner tube of the resonator was actually 2".

Keywords

Porsche, 924S, 944, Thrush, welded, exhaust, glasspack

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