I have never heard of a cel from a high flow cat. I had it on my last car and never threw a cel. However my friend had a high flow and switch to a test pipe and thats when the cel came on.

 

And also with the VAFC, do you have to take it to a shop to get it wired up?

 

yes they have to sodder it to your wiring harness, unless you have the skill to do it

 

And when it comes to tuning it can I do it myself?

 

nope you have to have a shop do it with a dyno, and make sure they are a good qualified shop because if improperly tuned it will mess your motor up major. when you get it you wont have a clue what any of the settings mean and you have to have it dynoed so they can tune for optimum safe horse power.

 

dont know where you live but where i live it was 150$ to get it installed then 150$ to get it dyno tuned thats about 1.5-2hrs dyno time where i live. but remember if you ever get a turbo like i have now the only use it will have is to change your vtec engagement point. once you get a turbo or put cams in youll want a piggyback system like a hondata, crome, uberdata, emanage ect.