How bad would i need a tune with a 10.5 hotside and ebay 02 housing added to my setup. I did search for a while on it but couldnt get a clear answer on if it was really needed for a retune for these. I'm sure the 02 housing wouldn't affect anything really but wasn't sure about the hotside.

 

yes......get a tune just like adding an exhaust or intake its a power adder

 

it will not hurt the car if it goes untuned but you will see more gains with a tune. just did the same mod then got tuned by AMS. Awesome

 

it's likely to push you into a higher load column and thus different fuel/timing values than intended. It might be a good idea to get it dialed in.

 

I'm agreeing with Mellon. A good tuner would have anticipated the higher load values with mods, but it's not going to be 100%. If you have a solid tune currently, it's not absolutely necessary to re-tune right after the upgrade, but it would be recommended to do some logs and get it dialed in soon after.

 

Thanks fellas, appreciate your advice.

 

anytime

 

I just did the same thing. I added a test pipe, O2 housing, ported ex manifold, and a 10.5 housing and my tune was way off!