Exhausted with my Exhaust...Help me

[Toe Knee]

:???:Need some help clarifying my options for my exhaust...:???:
*My Car: 2000 Acura Integra GSR in California
*My Problem: Cracked Stock Header/Can't find a 4-2-1 direct bolt-on header with 2'' outlet and O2 sensor bung for GSR, rather find this ?was told 00' LS/GS headers would work?
*My Ideas: Get header w/ 2.5'' outlet,get 2.5''-2'' reducer and connect to stock cat...How do reducers connect, welded and are there 2 bolt flanges or only 3 bolt?
*Or: Get header w/2.5'' outlet,get 2.5''inlet/2''outlet Catalytic and connect to stock 2''exhaust pipe...only can find universal cats that are 18'' long with out O2 sensor port, stock cat is 18''...In CA, I have to use the O2 sensors & Cat, so no test pipes....how do slip fit cats connect?
:???:Not sure what my options are, but would like to keep it cheap for now, but be able to upgrade the exhaust down the road and not have to buy anything twice. Please let me know my options. I want to get a new header with out having to do a bunch of modifications

 

[JDMxDB8]

Since you live in CA, I recommend getting a DC Sports or GReddy header so cops don't fuck with you for not have a CARB legal header.

 

[tisguy]

yea that CARB sticker saved my ass. Cops actually asked me how much i paid for the sticker because everything I had was CARB cert.

 

[Samurai_Blue]

damn all bad! yeah carb is the way to go in CA. saves you a whole lot of trouble too!

 

[Toe Knee]

Okay, carb is what I need, but what about sizing?

 

[Cheesenip]

why not get an oem ITR header, better performance...and its stock so you dont even have to worry bout carb

 

[Aussie]

I have a greddy 4-2-1 with the o2 bung and a 2" outlet I would sell you. It's also carb legal so you would be ok in CA.