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i wont buy the prefab cat back they're 3x more expensive then having a shop do the piping..thats why I was asking how big should I go on the piping from 1.75
that's what I was thinking was 2" to give it a little better flow but not too much since im not putting on any other mods, except the kn filter I already have in.
the magnaflow 2.5 inch catback works great. i had it on my 06 2.2 for a long time and loved it. none of them line up great but it gets a great sound
doesnt have to be tuned but it does help