I've heard that these guys are EXTREMELY proud of their stuff, but I have no personal experience with them. I've seen them set up a booth at local shows . . .

Mandrel Bent Pipes in Houston and Spring

 

Just an FYI, I've done a little research on these things and it looks like the y pipe is only made to clear a 4 speed trans and will not clear a 6 speed trans. I'm interested to see how it fits on your truck and what all you will have to do to "make it work".

I really dont want to pay the premium for ARH or kooks, but they seem to have a y pipe that clears the 6l80, and also offer a catted option. so i may end up going that route.

 

I have been there. They do excellent work but can only bend pipe up to 3".

 

Lloyd, don't you have a shop?

 

A true dual mandrel 3" coming off the headers would look stout. Certainly the icing on the cake with a blower pushing through it.

 

Slapped mine on a few days ago along with an Air Raid MIT. Had a few idle issues, but then again, I am more highly modified than the majority of the people just now getting to this mod. Nothing a few minutes with HPT couldn't fix. I can't tell much of a gain at all, but it was something that needed to be done. I was sick of the stock intake tube and figured I might as well do it while I was there.

 

Just ordered mine for my '08 5.3 Sierra and will report back after install. Did you guys have to replace the gasket for the throttle body?

 

nope. its a reusable O-ring.

 

I know the gains aren't huge by any means. More or less around the same as an UDP. But my response and driveability improved drastically. Not something your gonna beable to measure with the butt dyno but more like part throttle when it smoothly accelerates

 

I have noticed slightly smoother throttle, but I honestly can't attribute it solely to the tube or TB. I needed to dial my idle in on the tune a little more anyway, and when I put these on it really threw it out of whack. I finally just had a real reason to get the laptop out and make some scans and changes. I'm sure that there is an increase in power but I can't feel it on the *** dyno. Once you're over 400, 5 hp here and there doesn't feel like much. The REAL gains I saw this weekend were from turning the timing up 4*