Alright I ordered the apr ko3 chip from ecs and they said they were out of the chips and didn't know when apr would be sending them more. I was just going with the ko3 tune because I don't want to put in all the money for the supporting mods. I got the ko4 when my ko3 blew for about the same as rebuilding the ko3 if you are wondering why I have a ko4. I only want to run a few more psi. Maybe 15-16psi total. I was thinking about doing the diode and mbc(turboxs hpbc) and was wondering if at that psi would it be wise to upgrade to 4.0bar fpr? I was thinking the ko4 may flow more than the ko3 even at that low of boost level.

 

Anyone ever try this? Anyone at all

 

the ko3 chip will work with the ko4 and you should get 18psi easily with out any issues at all

 

I wanted to go mbc and diode. Not chip. Wanted to knonif I'd have any issues with FP with the ko4 at 16psi

 

Well first off you cant upgrade to a 4 bar FPR because your car already came with one stock. lol

The FPR must match to what the tuning calls for. So stock tunning needs the stock FPR.
The stock injectors and stock 4 bar fpr can handle 15-16psi.

 

What year do you have?

 

Well I feel dumb. Thought it was a 3bar. My bad. It's an 01 5 spd. Awm motor

 

BumpBump

 

yes, you can do it