In Reply to: Confused, yes - But...More posted by Doug on March 01, 2001 at 17:46:18:
The OEM resonator exits in the same place as the stock cat heat shield. It's a little over half as long as the cat heat shield assembly. (I have a picture in a book of the two, side-by-side)
I don't know what's in the resonator but here is a pic of a "DTM resonator" that motorsportimports.com sells. It looks like it might just be a widened area in the pipes used to tune the resonant frequencies in the exhaust (hence the name: resonator).
So, you could weld up some large chambers like you see in the picture but it might be easier ordering either the OEM or aftermarket one. The only difference would be cost and maybe weight. I wouldn't just weld same-diameter pipe in place of the cats though.
O.k. maybe I was confused about which car actually came without a catalytic converter but you do speak of a factory resonator and that is what my original question was about - Price? weight? part number? any disadvantage to using it over an aftermarket one? I wouldn't dream of chopping up my nearly new cat. but I would chop/weld the old one that I removed if an advantage in horse power could be gained. I was thinking that a jig could be built using the old center section, the cats could be cut off and new small resonators rewelded to it. Of course I haven't even researched to see if such resonators exist but the X section would already be there and the bends would be perfect. It'd have to be less than the $400.00 for aftermarket. Thoughts??