Exhaust questions...

[MR 325]

I have some questions for when I put my motor back in the car [stock M20]

I have an exhaust setup planned out in my head and I am just wondering what you guys think about it. I plan on running single piping for sure and was planning on running my headers, a Y in to 2.5 inch piping, 2 resonators where the stock cat/resonator would be, and then a Magnaflow style single in dual out muffler.

Is my exhaust piping going to be big enough?

Other thoughts?

[bkelsey86]

I think 2.5 will be plenty good you might want to even go 2.25 it just depends. I don't think you'd need much more then 2.5 unless you where going turbo.

[Rich V]

For a "i" motor 2.5" is perfect (especially if mandel bent). It represents about a 5% increase in flow area, not to mention less heat and turbulence due to less surface area. 2.25" would be too small.

[MR 325]

So should I do 2.5 guys? I know more of you have read this.

[trent]

Yes. Do 2.5.

[325is_e30]

yes, 2.5 is slightly more flowing than stock dual piping.

[MR 325]

Sounds like a plan then.

What size si the stock piping on the m20b25 cars? Obviously it's dual compared to me planning to run single.

[E30godz]

1 and 7/8ths i believe

[Mystikal]

2 x 45mm

[screamingbmwe30]

is your car running yet?

[Budget Beater]

2.5" single is best setup with a good y-pipe, ebay has a bunch of cheap 2.5" resonators that will do the job and a magnaflow single in dual out should sound refined but still meaty.

[Mot]

would this work? http://cgi.ebay.com/ebaymotors/Unive...spagenameZWDVW

[MR 325]

would this work?

That could work. I ended up putting a glasspack in my center section, no cat. Sounded really good

That exhaust has been sold though