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"I have not dyno'd it yet, but I am inclined to think the FabSpeed exhaust, which deletes the secondary cats and does flow very well, could offer somewhat of a power bump, especially when combined with good headers. Unfortunately, I am also coming to the conclusion that the only way to get a resonance free exhaust is to stick with stock."
I also thought that, and tried several mufflers. I finally got the Dansk sport muffler, the one that looks like the stock Boxster muffler, but has a higher flow rate. Gives a nice tone, and no resonance.
Ed
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My Car Webpage
2000 2.7L Boxster 102K; TTP intake, headers, high-flow cats; Dansk high-flow muffler; Autothority ECU chip; TechnoTorque 2; Bilstein coilovers; Racing Dynamics strut brace; stress-bar suspension kit; Aasco lightweight flywheel, B&M short shiftkit; 18" wheels; spare tire delete; OEM GT3 seats; JL audio speakers and subwoofer; Alpine PDX-5/PDX-2 amps; Kenwood DNX8120 CD/DVD/Nav; litronics, deambered
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