like the title says...was on the highway comin from a club and a acura type s comes up to me and wants to go at it..i was cruising at 65mph and he starts honkin,so i downshift to 3rd and go...all the way up to 140mph...well as soon as i passed 100mph i looked at me boost gauge and i was at 20psi and climbing....i do have a check engine light for running lean...i also do have nates 2.9 pulley,but somethings tellin me that its not a 2.9 it might be smaller,also it is cleary engraved 2.9 on the pulley it self...anyone got any suggestions...i do un-plug the battery and the light goes off,but comes back on...weather was about 45 degrees..any help?i knw im prolly maxing out the injectors,or maybe clogged cat?

Mods:GM s2,nates 2.9"

 

My guess is that your cat is beginning to clog, and you need to change it out or get rid of it fast before bad stuff happens.

 

x2 im with thius man measure your pulley if you want but most likely it is your cat. looks like its time for more mods

 

100% its a clogged cat! Same thing happened to my buddies car...it would creep all the way to 20psi and he only had stage 2. apparently stage 2 tunes are super rich. if you just gut your cat out it will be fine. just take the down pipe off and turn it upside down and all kinds of **** will fall out of it. Or just get a catless downpipe.

 

If you gut your cat will the CEL still throw?

 

You WILL throw a CEL if you take off your cat.


just find someone with a HPT, and turn code 440 (and there might be one more) to "Do Not Respond" or whatever it is

 

If you gut it out it will throw a code, if you got hptuners you can turn if off.

 

so the problem is the cat then...the engine lights been comin up every 2-3 days,sometimes twice a day...does any company make a downpipe with a cat so i dont throw a code?

 

nope just grab some one with hpt and you will be fine, or get a dp with a high flow cat its almost as good as running catless

 

so mind as well get a full exhaust then,and get more hp out of it then

 

exactly now your thinking

 

CA makes a downpipe with a high flow cat

 

yep mnot a bad header either, i run the cti lt header with there catless dp, i also have there high flo catted dp i think i got it all for 620

 

crap this sucks..this week i was plannin to do my excedy clutch install,looks like ill have to wait on that and buy the exhaust then

also...2.5" or 3" downpipe...i knw turbo cars like the 3",but does the slow balt like it?

 

why wait you gonna do it all at once