Sam26

I have an existing tune and intake right now. With long tube headers and x pipe I would be gaining an additional 60hp. 40 from the headers and 20 from the x pipe. Since I already have an existing tune, would 60 additional hp from the headers be the max? I know retuning it will get rid of the CEL code but will retuning it also provide more than 60 hp or will it just be 60? Thanks in advance.

AMG6.3

You should gain approx 50 rwhp with headers and retune. Pits u around 460-480 rwhp depending on dyno

Sam26

What if I don't retune it, will I still get 50rwhp from the headers and x pipe since I already have an existing tune?

Wobble64

Headers need a header tune. Not just for the CEL but also for the increased airflow. It does not make sense to spend 3-4 grand for headers and not make the upgrade complete with a matching tune.

chrisridebike8

Where did you get your tune? Companies like OE Tuning and EuroCharged give you new tunes to support future mods.

Wobble64

Chrisridebike, not sure who you are asking about the tune, mine is from MHP ( Modern Horsepower ) and I am very happy with it!

chrisridebike8

Sorry. It was meant for the OP. OP just seems to not want to retune for headers so I was asking where he got it. If it was a local shop, then a retune would cost more (no excuse in my book), but if he got an OE or EC tune or a similar company that offers free retunes, then maybe he just didnt know.

Sam26

I got the tune by ecu tuning group. I just thought the retune was for the cel code and if I'll get 60 hp with the headers and x pipe without the retune

mattsC63

Chrisridebike, not sure who you are asking about the tune, mine is from MHP ( Modern Horsepower ) and I am very happy with it!

I went with MHP as well Did you get the American Racing Headers w/ 3" pipes, if so you need a retuen of ECU

mattsC63

I went with MHP as well Did you get the American Racing Headers w/ 3" pipes, if so you need a retune of ECU otherwise you'll foul your O2 Sensors, and your plugs will be Coal Black - Been there did it.

They told me it was tuned for it, sent it to Weistec and now runs great