Software necessary for 3" exhaust?

BMW Maniac · #1 (**permalink**) 12-28-2006, 05:46 PM

I'm looking to adding a full 3" exhaust, but I'm curious if I'll need new software? I'm guessing yes, but just wanted to be sure. A friend of mine says I'm looking at adding anywhere from 30-50 rwhp with a 3" exhaust, so that is tempting.

James · #2 (**permalink**) 12-28-2006, 07:32 PM

Wheel horsepower? I guess it depends on what you have on the car now. What is your budget?

BMW Maniac · #3 (**permalink**) 12-28-2006, 07:57 PM

GT35r, M50 manifold, 42lb injectors, and stock cats...

James · #4 (**permalink**) 12-28-2006, 09:02 PM

I assume AA offers a program for a 3" exhaust - do they offer some sort of credit for your existing flash?

92318is · #5 (**permalink**) 01-02-2007, 08:27 AM

You will get a lot of power out of a turbo'd car with a full 3" turbo back exhaust. I put my stock catalytic converter on my car to pass emissions, and I noticed a huge decrease in power, and I still had the 3" downpipe and the 3" exhaust. Once I took the cat out and put back on the straight pipe, I noticed a huge increase in power. I can't give you exact numbers, but if I felt it on the butt dyno, then it had to be at least a 20hp difference or so.

BMW Maniac · #6 (**permalink**) 01-02-2007, 10:25 AM

Well, I guess I can always ask them right.

BMW Maniac · #7 (**permalink**) 01-04-2007, 05:30 AM

Apparently not necessary

Imported Cars · #8 (**permalink**) 02-25-2007, 10:41 AM

Quote:

Originally Posted by 2LT97M3

GT35r, M50 manifold, 42lb injectors, and stock cats...

Hows your new software and injector package, and did you get the DME alligned yet.

BMW Maniac · #9 (**permalink**) 02-25-2007, 01:53 PM

No, I'm waiting for my PLX300 to come in and then I'll do it all at once...I'm looking forward to it though!

Imported Cars · #10 (**permalink**) 02-25-2007, 06:03 PM

Quote:

Originally Posted by 2LT97M3

No, I'm waiting for my PLX300 to come in and then I'll do it all at once...I'm looking forward to it though!

You wont be disapointed, although you tires will... trying to get traction.

BMW Maniac · #11 (**permalink**) 02-25-2007, 06:40 PM

Just be sure to keep me posted when 500rwhp with the OBD II and 93 octane becomes available.

Imported Cars · #12 (**permalink**) 02-26-2007, 05:04 AM

Quote:

Originally Posted by 2LT97M3

Just be sure to keep me posted when 500rwhp with the OBD II and 93 octane becomes available.

Build the lower end and stage 3 software will take you to well over 500rwhp, stage 4 headers and larger turbo 600+rwhp and 600+rwt 93 octane FACTORY ECU.

BMW Maniac · #13 (**permalink**) 02-27-2007, 10:53 AM

Build the bottom end...I guess it is going to be a while then...what do you mean by headers, a different turbo manifold?