Exhaust question

[moroza]

Will putting bypass valves right before the cats be too loud? I ran the car once with nothing but headers on, and that was too loud, but I don't know how much the downpipes muffle the noise.

[E34nication]

The downpipes don't muffle much at all... I fired my car up with just the downpipes and it sounded like a Chevelle with dumps.

[moroza]

Hm. Suppose I put some aftermarket resonators in before the cats (and cutouts)?

[E34nication]

That would probably make it tolerable. Was going to ask why go through the trouble but it sounds like you're getting rid of the b30 exhaust huh?

[moroza]

Well, it's a lot less work to just redo the downpipes than the entire catback. Plus, I like the near-silence of the current setup, 90% of the time. Even my mom, with a particular dislike of engine noises, was impressed.

[me78569]

Yea it would be unbelievably loud haha. Every after the cats it was much louder than I could handle. I would put the bypass valve after the resonators.

[E34ever]

Yes, right after the resonators would be perfect, not too loud but noticable when you want it to be

[moroza]

Trouble is that the cats and resonators have the B30's skinny pipes. I'd rather not replace all that.

Maybe two of these:
http://www.kermatdi.com/catalog/aero%20resonator.JPG

replacing the sections of pipe here:
http://img844.imageshack.us/img844/8295/exhaustr.jpg

with a cutout right after (right before the cat)?

If junkyards didn't violently tear out the cats from parts cars, I'd just buy a stock B40 system and put cutouts somewhere there, but they don't.

[moroza]

Any suggestions? I've never worked with exhausts before.