Stage 1+ map on stock car?

[pro_steve]

In all honesty it doesn't make a blind bit of difference to safety (all my maps are safe, and tested under extreme conditions), I only suggest it because you're not going to get the full 125 on the dyno unless you've got the free flow exhaust system.

The free flow exhaust helps turbo spool, reduces back pressure and generally gets more air through the engine so it's going to run cleaner with the stage 1+.