Quick muffler question

[grant_71]

OK, I am going with a super single 3" outlet, on a pretty stock 302, maybe build up as I go, should my dual inlets on the muffler be 2 1/4" or 2 1/2", i am running stock manifolds, but will eventually be putting headers on.

TIA
Grant

 

[Jeepeater]

I went with 2(2.5") pipes from my headers into a y pipe...single 3" in muffler single 3" out muffler. might be a little excessive for a stock 5.0 but i loke the look of the 3" pipe, and its there when I upgrade my motor.

 

[grant_71]

Thanks, that is all i needed, it might be excessive, but when i get the funds for headers, like you said, its already there

Grant

EDIT
Now I am only finding like 6 mufflers on Summit that are single 3" out, dual 2.5" in, can I mount a 3" in, dual 2.5" out backwards? I thought that is what I heard most were doing.

 

[Jeepeater]

I ran the same setup as donsbolts...single 3" in magnaflo single 3" out. there is a thread on it.

 

[trailpsycho]

Yeah, the Magnaflows 2 X2.5" 3" outs can be run reverse...as you read the description on Summit Racing it says so. I believe this is the same Muffler being offered by BCB. Several others have reported thats the case at least. Good luck.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=MPE-12288&N=700+115&autoview=sku

http://store.summitracing.com/partd...2198&N=700+4294906128+400636+115&autoview=sku

http://store.summitracing.com/partd...4588&N=700+4294906128+400636+115&autoview=sku

http://store.summitracing.com/partd...2258&N=700+4294906128+400636+115&autoview=sku

They offer these polished too.

 

[BAMA]

I Ran (2) 2.5" Dual Chamber Flowmasters (with Headers) And It Sounds Mean. Be Sure And Tell Your Installer To Tuck The Exhaust Up Into The Frame For A Nice Clean Look.

 

[trailpsycho]

I believe this is the same one BCB sells. http://store.summitracing.com/partdetail.asp?autofilter=1&part=MPE-12588&N=700+115&autoview=sku

From the measurements of the pic, this is the same one....although any of the others above would be sufficient...its more a space thing...and getting the most muffler that you can fit. To get the polished version just replace the second number in the PN for a 4...EX: 12588 vs 14588 is the same muffler, the 14588 is just the polished case version. HTH.

 

[vertex]

I would go with the 2.5" pipes from the motor to the muffler. This size will work better when you do decide to go with the headers.

I used this muffler when I changed my duals to a single. If you are looking for a fairly quite muffler this is a good choice.

http://store.summitracing.com/partd...891681+4294791976+4294903588+115&autoview=sku

 

[00gyrhed]

muffler

2.25 is plenty for the head pipes, and the muffler outlet really doesn't need to be any larger than 2.5.

Contrary to popular belief bigger isn't better. Especially with a 302 off road or around town.

Keep in mind most exhaust charts are set to address WOT operation. Most I have seen recommend a 2.5 single for less than 300HP.

Bigger costs more, is harder to route, and easier to get hung up. The jump from (2) 2.25 into one 2.5 to (2) 2.5 into 3 probably cost you low end torque without giving you any noticeable gains at WOT, where you will not be operating anyway.