I ran a straight through cat on a newer 450hp turbo car before and really liked it. I tried with a straight pipe and fumes were knocking me out in traffic (figuratively of course) and worried about the fuzz since it was so smelly.
I found a "race cat" for offroad use for around $200 and it cut the fumes down by probably 75%. Not as much as a normal cat but also didnt affect HP much if at all. The cat was special made by a retailer though I got it second hand. when you looked through, it looked like a glass pack muffler with the holes around it. Id recommend that in a heart beat.
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