I just installed a B&B Turboback exhaust, but kept the factory cat on (for now). I did not have a single problem with fitment, or the gaskets they used. I love the look, and the sound is exactly how I wanted it, not to loud but noticeable at WOT.

My question is: Is it normal for the car to actually lose a bit of boost? I was seeing almost 19 at redline stock, and now its tapering to about 1.2 bar. The car does feel faster! Do i really need to reset the ECU per instructions?

TIA..

 

Totally normal.

 

you're supposed to reset the ecu after installing their exhaust? Does disconnecting the battery accomplish this?

 

Yes it does. Its also a good idea to step on the break for 10secs. or so to drain any remaining juice outta the system. The ECU should be reset after that.

When I installed my Vishnu TB I noticed a bit of a boost drop for the first day or so also. Once the ECU optimized itself again boost would peak 1 or 2 PSI higher than stock and seemed like it would not taper as bad. I did replace to 02 housing too, so that may have something to do with it.

 

Resetting the ecu will not effect the boost - its a open loop system

I suggest a MBC or EBC and / or a boost controlling reflash like our stage rev - you will not get higher boost but it will stay steady to red line instead of falling off with our reflash

 

Thats strange with my hks cat back and dp my boost increased to about 20-21. And I never reset the ecu.