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On my old car, I was running both precats and the Y cat. The guy who owned it before I did unbolted it after the Y cat and it wasn't too terribly loud. My car sits that way right now because I was going to swap the exhaust from my old car to the new one. I went with 2.5 piping on my last exhaust and didn't seem to loose any power. I have asked around and have been told that running anything bigger than 2.5 piping will kill my power.
If memory serves me right, the stock piping is 2 1/4" so a 1/4" bigger will only help it flow better without taking any power away.
I also don't intend to stick the pipes through any body panels. I wanted the tips to poke out underneath the cars body in front of the rear tire. Best part about it is if it doesn't work, I can cut it up and run it to the rear.
Keith
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The member formerly known as Civic_Slayer
1992 "Robins egg blue" SVX Originally Claret 147k- CURRENT
1992 Pearly 187K and climbing (11-91) #964 *retired
1992 Pearl SVX 122500 miles #86 FASTAR THAN THE OLD ONE.*SOLD 
Everytime I get into my car, it always reminds me that it has POWER
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