go with the 3" in, to 4" out... then just use a flowmaster smooth reducer.

 

ok thanks

 

That's funny because I just bought his intake setup off his car and i'm getting the same TFS 215 heads. I'm hoping for 460+ hp through an m6.

The gains from that flowmaster merge is amazing. I'm going to ask him for further details on it.

 

Its a small world. Chris might have talked to you into the TFS 215's.... and I guess you should get them if you have the cash. I went with the TFS As Cast 220's hand ported by TEA. Saved me 500-600 bucks compared to the CNC 215's and they flow just as good as the CNC version. Might want to take that into consideration. Just trying to save you a buck.

 

https://ls1tech.com/forums/generatio...ter-merge.html

Heres my custom Ypipe. Same as chrs1313 but I went with 3" to 3.5" out.

 

you DONT hve to get the flowmaster although the merge is nice on that piece. The magnaflow y pipe comes in 3'' in and out and also stainless for a good price. That would a better option as well. Its not about looks here, we are just trying to help you rid of nasty sounding exhaust gases and also get you more usable horsepower
goodluck!

 

http://www.summitracing.com/parts/WL...RO&prefilter=1

any one ever have any experience with this

 

This setup is meant to work with factory manifolds, and not the long tubes like you have...

 

yea thats what i relized after lol thank god i didnt order

 

how much does the flowmaster y-merge cost? anyone have the part # for the 3" in/3.5" out?

 

$40..... look on summit racing... type flowmaster collectors in the serch box