jb4 stage 2 with only MPE and no downpipe?

[DORY]

will my m4 work a stage 2 jb4 with only a MPE and no downpipe? im afraid my car will get too loud with an MPE + a downpipe.

[Myaddiction]

I'm guessing you mean map 2 on the JB4?
If so the only way to tell is to catalog a few runs and email it to BMS and they will tell you. It's possible it'll be fine but if not you'll see timing pulls.

Try it and see. The support is part of what you paid for when you bought it.

[schnazzy]

This is a question for Terry but you need to be running 93 octane or better. it would seem that you can run map2 with just the MPE (which really is not an exhaust mod since it retains the cats), but just with even a bit more than 93 octane. If you try, I'd definitely log it so you can see what is truly happening.

Oh and yes, the MPE plus akra DPs as an example is fricken loud. however, with the jb4 you can keep the valves closed and it sound wicked but very quiet in comparison.

However with them open and the car warmed up just some simple 1k-2k revs... the car sounds mean. very deep and throaty. as you move up the RPM it starts to get really loud (full throttle)

[///M ARMY]

Originally Posted by DORY

will my m4 work a stage 2 jb4 with only a MPE and no downpipe? im afraid my car will get too loud with an MPE + a downpipe.

With the current mods that you have, you should run map 1. Running map 2 suggest running a higher octane. The Downpipe is the best bang for the buck. The Jb4 system also offers your to manually open and close your valve control.