by Arith » Fri Feb 20, 2009 1:19 pm
I just spoke with Phat and the results for his mufflers are quite positive. A monster MY07 STi that Phat has been modifying and sports Phat's full setup (mufflers, dump pipe, 3" centre, x2 resonators, etc) just had a tune the other day, and resulted in 262kw atw. This is with 17 psi of boost (full boost comes on at 3,180 RPM and stays at 17 psi to redline). This is an extremely great result considering there are no engine mods like headers or cams. Only bigger turbo, ignition upgrade, front mount, custom turbo inlet pipe, and a few other goodies. But the engine itself is completely stock.
In any case, measurements were taken and there was 11.1 psi of manifold pressure (before the turbo). After the turbo, the back pressure was virtually zero. The instruments couldn't pick up any back pressure, which is of greatest benefit to the turbos. Meanwhile at idle, the exhaust noise was near stock levels due to the x2 resonators (3" straight through) and well designed mufflers. But open it up a bit and the exhaust note is still there as normal with still no drone inside the cabine. This is an excellent stealth mod for those worried about noise levels and attracting unwanted attention (while idle).
Jig should be done by today and we should start seeing a few mufflers by mid-next week. The 1st batch will go to those who have volunteered their time and effort.
[ Former Liberty ... Slightly Modified -> Click here for modifications & profile ]