jwfisher

I've seen a lot of Solo-II folks switch to a different catback system - suppossedly for torque gains. But, looking over the dyno charts there doesn't appear to be much there - even with a header switch.

Is there a torque gain, does it persist right up to redline? What are people using - the Mugen system looks good, the CompTech system looks even better (different being the dual tubes out of the resonator).

What about drone at highway cruising RPM? That's a typical problem with most aftermarket systems...

cdelena

There are only small gains with any of the cat back systems and even a loss reported with some. With the Mugen header there is a small torque gain at low rpm that aids drivability around town and enough gain in the 6 to 7.5 range to consistently measure but not necessarily feel.

All of the exhaust systems seem to introduce a lot of interior noise (not much deadening). The two I have tried (HKS, Mugen) both have a little boom at low/mid rpm with some throttle positions (a bit more pronounced with the HKS), but highway cruising is normally at a higher, quieter rpm.

jwfisher

Are you running the Mugen now? Has it added any mid-range, or taken away any low-range?

meat

Don't forget the weight savings that some aftermarket exhausts will give you. I think the Mugen exhaust saves you 20 lbs.

cdelena

Yes, I still have it. The gain at low rpm is slight but perceptible (at least when first installed). The dyno shows a gain at 6-7.5K but I don't know that it is enough to feel the difference.

As mentioned, the advantages are weight reduction, different sound & look, and small a power increase. At a relatively high cost.