[sampi]

Anyone out there own a JB4 on their stock BMW?
What maps do you run and is it even worth getting a JB4 if the car is stock?
What are your gains?

[CapitaineBeaver]

Originally Posted by sampi17

Anyone out there own a JB4 on their stock BMW?
What maps do you run and is it even worth getting a JB4 if the car is stock?
What are your gains?

Can't speak for actual gains but i've run up to map 5 (mostly map 3, map 5 at the track) without issue. Only other modification are a BMS intake. Is it worth it ? Yes it awakes the car a lot.

[Winemaker2]

Since Dinan came out with Stage 1 V2 I have been very pleased and even though I didn't need to do it, I took it to a friend's shop and it passed CA smog. Power gains appear to be at or near what Dinan is publishing. So living in Cali you may want to consider.

[mike@x-ph.com]

Originally Posted by sampi17

Anyone out there own a JB4 on their stock BMW?
What maps do you run and is it even worth getting a JB4 if the car is stock?
What are your gains?

Power gains are up to 40hp to the wheels (55hp crank) for a B48
gains with bolt on parts, higher octane, and larger turbos are even higher.