Quote:
Originally Posted by Humtek
Agreed. I don't get why people insist on wanting high flow cats in the downpipes? Is it because they don't want to deal with the CEL? Performance wise, keep the downpipes catless. If you need high flow cats put them in the mid-pipes somewhere.... Easier to replace if the cat fails. MEOW! 
Good to see more competition for the XI's though. When I first bought it was either AR or UR. And UR's build quality didn't look well and IIRC JPSIMON had issues with his pipes rusting and eventually cracking  |
Sound. Catless drones like a bitch compared to catted.
UR is still the best option IMO. They confirmed that they've never had a part fail due to rust or corrosion. The piping is 304 stainless and the flanges are 3/8" steel. The flanges will develop surface rust over time if left alone, but a shot of POR-15 or some other rust spray would probably do the trick as preventative maintenance.
For half the price of AR for essentially the same thing (I'm okay losing 5-10WHP), I see no issues.