Which resonator?

[KenC]

I just installed a Magnaflow catback, and deleted the stock resonator in the process. It's a 2.5" catback now instead of the stock 2.25". It now sounds like a ricer fartcan at anything above 2500rpms.

Which resonator should I install to get rid of all the high rasp?

[MonkeyMadness]

Don't, find a nice muffler.

[liquidgroove]

If you also remove the cat, then find the longest round body muffler to fit under there.

Don't try to fit an oval muffler in center section. I made a mistake by using an oval shape muffler (magnaflow 11366) as resonator. It was a little too thick.

Installer had to cut away a portion of heat shield to fit and avoiding hanging the box too low. This will heat up CSB and kill it fast.

[nando]

an oval muffler will fit fine if you mount it further back, just in front of the subframe.

defintely add a muffler of some sort, largest you can fit (unless you like the fart can sound). a resonator isn't going to do piss all to tone down the awful sound, which is mostly caused by the magnaflow that is probably too small to begin with.

[CorvallisBMW]

The magnaflow is 2.5" in and out... can't imagine it being too small. It was run on a 325e race car which I'm guessing flows more exhaust gas than an m42. And what the heck is wrong with magnaflows? I'd say 50% of the aftermarket mufflers on e30s are magnaflows, everyone loves them.


Kenny, Jeff would probably throw in an 18" glasspack for another $30. Anyone have input on whether a glasspack between the cat and magnaflow would help the sound?

[nando]

I don't mean the exhaust diameter, I mean the physical size of the muffler.

[CorvallisBMW]

It's pretty big, larger than the stock one for sure.

[nando]

right, but it also has a larger pipe diameter, so the muffler needs to be larger to compensate.

anyway, adding a center muffler/glasspack should help significantly.

[KenC]

The muffler came with 2.5" in and out tips. I didn't use a reducer into it. It's 2.5" from the cat back... he just welded my flange onto it. It's definitely the right size for a 2.5" exhaust, and is bigger than the stock 318 muffler.

I'll have him put a glasspack in next week.

[liquidgroove]

It's pretty big, larger than the stock one for sure.

Similar size to this? It's a 22 inch 5x11" Mangaflow

[KenC]

I looked at it yesterday. It's way bigger than a stock m42 muffler

[MR 325]

I'd definitely suggest a big glasspack or cherry bomb. If you're baller the Flowmaster hushpower mufflers are amazing too.

[CorvallisBMW]

Similar size to this? It's a 22 inch 5x11" Mangaflow

[ATTACH]41790[/ATTACH]

Damn, that's a work of art right there. Beautiful!