NBot as long as it is Long enough and has enough volume (you want 1.5x volume of engine as rulle of thumb) ~3.75L=3750cm^3 I would go for the longest 5x8" Magnaflow I could find in 3", which is 24" long. Part number in case you're interested is 12279.

2000 SVT Turbo 295hp/269ftlb@12psi #1 for Bendix Brakes Kits! Knuckles rebuilt w/new bearings $55 AUSSIE ENDLINKS $70 Gutted pre-cats $80/set A lack of planning on your part does not constitute an emergency on mine!