Ok i just ordered an AEM cai from speed and style dot com. i also order the bypass valve. my question is this.. the bypass vavle that i ordered is the 3 inch one i wasn't for sure what size to get so i just got the biggest one. is there any reason behind the different sizes? thank

1997 Mitsubishi Eclipse GSX: K&N Filter, John Sheppard built transmission with GVR4 1st gear, autometer boost gauge, "free mods", Greddy type-s BOV, broken shifter

you got the wrong size the size of the valve fits certian intake pipes. the size of an aem intake for our cars is 2.5 inches but if you got a different brand it may be bigger

traded in my 99 2g RS for a Titanium Pearl 03 3g GT
mods:AEM CAI[]energy suspension shifter bushing[]Short shifter[] MOMO f16 evo carbon/titanium shift knob[] DM Motor Mounts

I just got my AEM CAI yesturday, If you ordered one for the Non-Turbo you will need to get the 2.5, The 3inch will be to big.

98 Eclipse GS:
Greddy Evo
RH z5000 19's
Blitz Kit
AEM CAI

While we're on the topic of the bypass valve, do you have to actually cut the pipe for the intake to install the bypass valve. I wasn't sure how you install that and that sounds like the only possible way.

On the new AEMs yeah you have to cut it. On the older ones they came in two pieces and it went in between. You probably got a new one.

I have the older style (2 pieces) but I still cut mine so the placement of the valve was in a better location. I think it's better that way rather than have it limited to where the pipes connect which I think is a bad location for it.

-"Easy Mac"
05 Mazda RX-8 (RR8 #88)
99 Eclipse RS 398whp & 372lb-ft