I have to agree with themoth. The 4.8is stock exhaust is awesome, but the exhaust note would get lost through the RPM range. There were more times when it sounded like an I6 than a V8.

I love the Dinan exhaust on the 4.8is, the exhaust note is more notable, and you hear it more through the RPM range. Performance or not, I think the Dinan exhaust beats the stock exhaust.

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Jeff
Current:
'07 Jeep Wrangler
'06 BMW X5 3.0i

Former:
'12 WRX; '08 WRX; '06 BMW X5 4.8is Dinan S1; '02 BMW 530i Dinan S2