which magnaflow muffler should i use to do custom exhaust??

The longest, oval, 5x8 satin one that will fit. Pick a centre outlet, offset inlet. Don't forget a resonator.

Read this, I wrote it a while ago... it's a quick read and should tell you just about everything you need to know to pick out a nice deep sounding exhaust that will get compliments.
http://www.j-body.org/forums/read.php?f=2&i=361714&t=361714#361714

Where I got my magnaflow stuff...
http://www.hottexhaust.com



" To study and not think is a waste. To think and not study is dangerous. "

MagnaFlow Street Series 14832

Double Wall, Straight Cut
2.25" Inlet, 4" Diam. Tip
4" Tip Length
5" x 8" Oval Body
14" Muffler Body Length







Hope that helps you out.

Im running a magnaflow 4" round behind the cat and a 6" round after the axle. I dont like Magnaflows tipped mufflers becasue the inside is very small, If the inlet is 2 1/4 the inside looks less than 2". but the uniersals are one size in and out.