Posted 22 July 2010 - 03:34 AM
My stock 3.0 ran 129.8kw ATW on a reliable (read not tuners) dyno, put an exhaust on that is too big and you lose torque, I know I tried it....best option is cat back, 3" from the cat to the split, the 2.5" from the split to the mufflers, very happy with the sound from mine, and BTW, leave the standard centre muffler in, it really does help torque and sound quality IMHO, I have run with and without, definitely better with.
Also IMHO from the research I have done so far I believe that twin scroll single turbo is the best option, however I am seriously looking down the supercharger route as there is no stuffing around with exhausts and manifolds.....and you really can't run more than 7psi safely on stock internals anyway and the supercharger will deliver that nicely.
Simple ECU tune to put a bit more fuel in seems to work sell also, the engines are tuned very lean, unusual for Subaru, but shows in consumption figures, I regularly see 9.6L/100, not bad for a 6 cylinder, even with a bit more fuel being tossed in.
Regards
Paul
GEN4 Black Liberty 3.0R Spec B Wagon
GEN1 Red Mica RS Liberty - Stock factory original
Love is a Legacy, Liberty, etc......