is it true ?

[shepswrx]

can i fit a performance downpipe to my 04 wrx without changing any of the timing or fueling maps as ive been told it doesnt effect these or the boost levels.

[WRXtreme]

I've heard of plenty of people running just a TBE and I plan on doing it in the future. I do believe however it does raise the boost a small amount as compared to stock.

[WRXblurr]

when i put on my down pipe i didnt notice any change in boost.. if thier were they were very little.. the car felt alot faster though .

[IBAUCLAPlaya]

Boost does raise about 1.5 psi.

[WRX_2NR]

This is correct boost does go up about 1-psi, due to less restriction from the cats

[WRXblurr]

If you have a mbc set to a certian psi it wont change anything.. if you just stock then yes it will