ECU??

[yerv[g35]]

what do u guys think? whats the best 1 out right now i hav a 03 sedan

[joe603]

I assume your talking about engine management... UTECH is the best; but you really only need it for FI.

[pae9132]

DO NOT buy the UTEC for your 03 sedan. I bought it already and I had to send it back because it doesn't fit the ECU wiring harness. Had to get it refunded. I sent my ecu into Technosquare INC. You might want to check them out. I got the rev limiter raised, top speed taken off (like I needed that), and a smoother power band (IMO). The only thing is that it comes back with a sticker on it saying you need to use atleast 92 octane gas. So I have to buy octane boosters since CA only sells 91octane. Good Luck

[yerv[g35]]

where kan i get a octane buster

[Q45tech]

Unfortunately octane boosters in a can contain oganometallic compounds which foul spark plugs and cats and create deposits on valves.Plus they intentionally confuse you with the word "octane point" while you think they mean 1.0 they really mean 0.1 increase in octane.

Most gasoline can be bought up to spec by 15-20% m-xylene or toluene added to gasoline....................unless you buy these in 55 gallon drums wholesale it will be more cost effective to just buy racing gasoline or mix 50/50 racing with the best pump premiums.