I recently purchased an invidia dual and was looking to cut down on the drone with a test pipe. I'm going turbo in the spring, but will likely go with the greddy kit, so it would be a bit of a waste to spend money on engine management now. That being said, if i go with a megan resonated test pipe will I run too lean? If so whats my cheapest option to tune with as a temp. solution? I dont see all of the used VAFC-II's that I hear so much about. My S is a daily driver/only vehicle so cutting down on the drone is a bit of a priority at the moment. I have a stock car other than the catback, has anyone ever blown an engine from a test pipe causing their car to run to lean? especially in an NA application?

 

the ecu will adjust, trust me u wont run any close to lean.

 

when you start putting on intake/exhaust/TP, your A/F ratio increases slightly right? what does the ECU actually do to "adjust"? does it add more fuel to try to match the original A/F ratio?

 

 

thats kinda what I wanted to hear, anyone else?

 

your stock ecu will adjust but when you install it all you should reset the ECU and drive around a bit to let it learn.

you don't really need to get a tune unless you make a big change like FI or stroking the motor or something like that. but getting a tune could maximize your gains.

 

how do you reset the ecu? how important is this?

 

just disconnect the negative battery terminal and let it sit for like 15 minutes. it'll let the ECU learn faster I THINK (please correct me if i am wrong).