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my last car had a a high flow Random Technology cat on my CP-E downpipe. For me, i would never own a car without a high flow cat ...just do not like the smell of the exhaust without it and certainly the inspection issues and CEL lights that seem to come for some..I no i may be dissing 5hp or so with the cat but my BMW 135i with the JB4 has more power than i need so i have not put a cat on this car till after my warranty is over..just to much a pain in the ass for me to take it off,.....Check with CP-E they make some great exhaust parts and they warranty there cats for the life of your car as well as getting it through inspection....
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