So I was tuned by Bakaunichi a couple of months ago and at the time I was only able to slap on a few performance parts and stick it on the dyno.

I currenly have an AEM intake Ultimate racing UICP and a Cp-e HFC, Jon crushed my BOV and modded my boost pill for more boost. The car made 286whp @ 3500ft elevation (Jon can work wonders I tell you what)

Now I want a catback exhaust, what will adding this do to my tune or will it have any affect at all?

Thanks

 

Yes adding a catback exhaust it will slighly affect your current tune; it will positively improve your performance, you will gain some power with a complete and better exhaust system; but is highly recommended that you retune your car after adding the catback exhaust because when you improve the exhaust flow, the turbine react diferents, the top rpm power, the co2 readings etc. will going to be affected; also the entire torque curve and top end power band it will slightly moved out to diferents points of your current tune.

Catback exhaust and retune!!!

 

Yeah thats what I thought, Baka was only here on a special trip and there are no other Evo tuners in western Canada. getting a re-tune is not that easy.

I was thinking I will just adjust the tune myself as I can't imagine the catback will change the tune that much.

 

But of course that you still will be able to run and race the car with the catback exhaust without retune, and you will still feel good power, you will feel some things slightly different but still you can use it on that way, and race on that way only if you don't matter a lot about have a major mods without a tune? for example I personally don't care a lot about tune; but if you are the person who will have inside your mind the preocupation about if your engine is it or not at the most optimal performance after the catback exhaust upgrade?, then you must retune it for sure.

NOTE: But always if you don't retune, be sure that the AFR is at optimal condition, it could slightly change a little after the catback exhaust upgrade, so I highly recommend that you give special attention to the AFR and boost levels after the exhaust upgrade.

Thanks.

 

A cat-back probably won't change things enough to need a complete re-tune. Just make sure your AFR still looks good, no knock, and you aren't overboosting like crazy now that you can build that boost a little sooner.

The stock cat-back isn't all that restrictive at your mod level so the change shouldn't be huge.

 

If he tuned your car with a HFC installed then adding catback would be no problem at all,
because We run Cobb stage 2 map with just HFC or Turboback exhaust with no problem at all.