ok I will tell you what I think and also let you know how I beat the CEL. I dont believe in test pipes unless its for off road use only like my atvs. But a high flow cat is a great way to incrase flow while still respecting the environment.
Now I got the exhaust shop that made my exhaust to to take my stock cat and cut into the actual casing until the inlet and outlet were 3 inches. Which allowed my o2 sensor to still read from the tricky design of the cat while flowing just a tad bit more cfm (its probly only flowing 50-75 more cfm than the cat is in stock form but its legal, cheap and works). Now wheather or not thats politically correct to everyone I could care less but did it cause my CEL to come on NOPE and it works great with my Cobb tune
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09 Ralliart=256whp & 290wtq
Current Mods
Injen SRI, UR UICP & LICP, UR 4.5 IC, COBB AP custome stg 2 tune, 3in TBE, Whiteline front strut bar, RRM rear strut bar, tint, roof spoiler, 2.5 turbo compressor outlet pipe, AMS BOV, AMS Boost Pill, TWE Catch Can, Megan Racing Coil Overs
Future Engine and Tranny Mods:
Water Meth Kit
SSP Oil Cooler
Fan for Stock Trans Cooler w/ washable filter
Future Suspension Mods:
Sway Bars
Rear Diff Bushing Kit
Cusco 4 or 5 pt Brace
Front Cross Member
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