Magnaflow or Vibrant?

[Suspence]

Can't decide, I have a 88 e30 with K&N Intake, IE Headers, Dinan Chip and a few other small goodies. What do you think would sound better?

http://www.verociousmotorsports.com/Shop-by-Category/Dual-Tip-Universal-Mufflers/2-5-Vibrant-Performance-Universal-Muffler-Dual-3-5-Round-Straight-Cut-Tips-1040

http://cgi.ebay.com/ebaymotors/Magnaflow-14816-Polished-Stainless-Steel-Muffler-w-Tip_W0QQcmdZViewItemQQhashZitem1c0bbb224aQQitemZ120455897674QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

[dinanm3atl]

I really liked my vibrant on my e36. They made a bolt on. Have heard the E30s with Magnaflow though and they sound great...

[nando]

2.25" single inlet mufflers suck. that's smaller than stock. Plus magnaflows are loud. Maybe I'm just old, but I'd go for the vibrant. At least you can get a 2.5" inlet.

[BigTe30]

i couldn't be haappier with my magnaflow 14815

http://www.youtube.com/watch?v=oa_EyKlaSvw&feature=related

[Kershaw]

unless someone with knowledge in fluid dynamics can chime in here and give you the flow rates of dual 2.25" and what would be an equivalent flow rate in a single inlet, i would stick to dual 2.25" in.

i have no knowledge in fluid dynamics, so im just throwing this out there. but i'd go to at least a 2.75", if not a 3" for the inlet if you make it a single. but as i said, i think sticking to dual 2.25" in is ideal.

[nando]

a single 2.25" definitely flows less than stock (approximately dual 1 7/8"). It comes down to surface area and cross section. The cross section is much smaller, enough to offset the decrease in surface area.

2.5" single inlet would be fine for a mostly stock engine

[e30_3I8I]

i have the 2.25 magna flow muffler... i like it alot i bit loud but it only bothers neighbors/ or people on the streets=]

[Kershaw]

a single 2.25" definitely flows less than stock (approximately dual 1 7/8"). It comes down to surface area and cross section. The cross section is much smaller, enough to offset the decrease in surface area.

2.5" single inlet would be fine for a mostly stock engine

i thought stock was a dual 2.25", or is that just the outer diameter of the pipes? is the 1 7/8" OD or ID?

[z31maniac]

Thermal Research and Development.

That's the muffler I'd buy.

[nando]

i thought stock was a dual 2.25", or is that just the outer diameter of the pipes? is the 1 7/8" OD or ID?

no, it's way smaller than that

the actual dimension is in MM, I don't remember exactly, I just know it's close to 1 7/8". I think that's OD.

The cross sectional area of a single 2.25" muffler would be reduced by over an inch and a half from stock.

[Kershaw]

good info, thanks.

[dinanm3atl]

i thought stock was a dual 2.25", or is that just the outer diameter of the pipes? is the 1 7/8" OD or ID?

IIRC a late model E36 M3 has 2" or 2.25" dual. The e30 is much smaller.

[Suspence]

Hmm, I still can't decide.