I have a Stillen y-pipe with a Stillen exhaust. I have had this settup on for about 6 months now. I even had a resonator put on, but it is just to damn loud. So I put the stock muffler back on, and MAN it is so quiet!! I want to get a 2000 muffler maybe, to get back the low end and gain the top end as well. Will this work well??? I thought I heard this muffler gives about 5-7 hp or something like that.

 

Blade99SE, he hasn't been around lately... He said it didn't do much until he added the Y and then he thought it added power, but I don't think he did a dyno before and after or anything. Personally, seeing how much the 2k exhaust costs, I don't think it's worth it. You might get a couple extra HP over the stock 4th gen exhaust, maybe 5 peak, and I don't think that's enough to justify the cost though... His car is fairly quiet, but when we line up side by side I still can't hear my car over his I like my nice quiet stock exhaust...