Megan exhaust manifold? People who have had them and their opinions about power increase over stock? MAP says +15hp +20 TQ. I know about the issues with cracking and I'm more curious about dyno results

 

I'd port and polish your OEM manifold. The risk of cracking is a bit too high.

 

Does anyone have any data on power gains?

 

+1...ive heard bad things about the megan manifolds...they are cheap so i guess you get what you pay for

 

I had one on my car in the past for about a year with no issues. No dyno number because I did two mail in tunes through dynoflash years ago. I did however improve in the 1/4 mile from a best of 12.7 to a 12.4 with a 4mph increase. I live in the northeast and it saw all different types of weather. Never cracked and no issues.

 

Megan is starting to step up a bit in their parts, from what it seems. Cracking happens but not as often as people think, and From what I have read they have cracked on the welds by the flange.

 

Mine cracked to pieces at anti-lag ports and destroyed the turbine wheel

 

any more info on hp increase and are Megan and MAP's claims valid?

 

you can buy my crack peace of **** manifold for cheap if you want lol

 

I have had mine for a year, no issues at all. Harsh temp change(100 degree summers, below freezing winters) no graphs but I put 329 on the dyno, did the megan mani and map external dump o2 housing, now vdr shows 345. I did re tune though so I'm not sure how much the manifold alone did. Just my .02 but I know people have had problems so it seems hit or miss, good Lu k.