I was told when I installed my DC manifold and O2 housing that I did not need a retune. I hope that this is true?

 

Well it is always a good idea to tune after mods and the parts you added will reduce back pressure, but I wouldnt think the car should do what you are describing. I plan on installing a ported mani, 10.5, and O2 very soon so I hope my car will fine. I am going to get tuned though. I have heard about issues with 10.5s and O2 housings but not like what you have descpribed. Weird.

 

**will run fine**

 

when i installed mine i had the same problem. the fix was the wastgaate line and the turbo line off the boost controller got switched on accident. switched the lines and full boost across the power band.


Hope that helps.