Smoke Em

is it possible to pass the sniffer test with pacesetter LT on a stock lt1? 95 z28

will it pass without cats, egr, air?? or should i leave cats on somehow?
im just lookin for an idea, if its gonna be close or is it gonna blow it away?

let me know what you think

thanks

djjab57

iTrader: (17)

your not going to pass without cats, and dont think you will deleting air and EGR either. you can pass with lt's as long as you keep the emissions

Smoke Em

i was planing on doing a dual cutout setup right after the headers on the ORY and then have cats down the line

were is the best place to put the cats?? somewhere on the Y?

97LT1

iTrader: (3)

You want to be careful with how close you locate any opening (cutout) to the header. It will allow air to reach o2 sensors and throw off readings of you get too close. I would try to get a smaller tube style high flow cat to place right where the stock cat location was.

You just need the air portion of your system to "look" ok on your car for the testing. It will not throw a code if you disable it. Pulling the fuse will do this from what I understand on 95 and below. After you pass you can put plugs in and block off air portion on your headers.

Smoke Em

where is the stock cat location on a 95? is it after the Y?
my camaro is a 95 but with a 96 exhaust with 2 cats on the downpipe, really close to the block, were the LT's would be

Smoke Em

is it worth it to put a cutout after the cats? or should i not even bother with the cut out

J2Pharren1

iTrader: (1)

You want the Long tubes to come down, with your Y or X pipe connected with flanges so it can be bolted on or off, do not weld it to the headers. Then you want the cutouts to be before the cats (otherwise you are defeating the purpose of a cutout), and in the "straight" part of the Y/X pipe. You need 2 cats and 2 cutouts, don't try to pull it off once the Y pipe comes together.

madhatter

There are people that have passed with no cats with a good tune.

Smoke Em

is there enough room on the part of the Y pipe that connects the 2 headers into one for a 2 cutouts and 2 cats?

flame

iTrader: (13)

Here is pics of my dual catted y-pipe. I bought Pacestters ORY and added the fullsize 3" Magnaflow converters. I did a track test with an ORY and I ran the same ET and MPH as with cats so don't worry about cutouts. You could fit them but you loose a lot of ground clearance. Depending on the emission limits in your state you may have trouble on Nox due to the EGR not functioning properly with the reduced back pressure in the exhaust.

Smoke Em

thanks that helps alot, clears up alot of my questions

Smoke Em

why did u weld up on side of the cats? why not jsut use clamps both sides?

Smoke Em

what else would i need to get with headers? and keep all the emissions

Smoke Em

is this cat going to work with the y pipe if i put 2 of them? do i need to spot for the air on the cat?

http://www.summitracing.com/parts/MPE-53009/

djjab57

iTrader: (17)

they will work and you dont have any air connections for the cats

flame

iTrader: (13)

They make a shorter version of the cat that would fit better. The guts are the same but the overall length is about 3 inches shorter. I don't have the part number for it though. You can use clamps if you like but I hate leaks so welding is better. As said above you don't need air pipes on the cats.

Smoke Em

so those air pipes on the cats have nothing to do with the AIR on the car for emissions, i wont need it even if i am keeping all the emissions stuff, air egr

flame

iTrader: (13)

Correct no air pipes on the cats. Factory air feeds the manifolds on cold start to help light up the cats. Your headers will have the same connections

Smoke Em

are those capped off on the pics you posted? those things are the air pipes correct?

flame

iTrader: (13)

Yeah the cats I ended up with had the pipes but just left them capped off. Thats all they had in stock when I got mine.