RallyBoy

iTrader: (1)

anyone have any pics of their custom y-pipe with cats? I am ordering a set of Mac mids and I want to keep the car emmisions legal. I want to add cats to the mac y-pipe.

lt1noob

iTrader: (4)

im thinking mac mids too and wondering how this will fit because i already have flowmaster that id like to keep.

Pampered-Z

The Macs come with a Y-pipe that keep the Cats in the stock locations ( only way to be 100% leagal). They fit nice and are well made. We had one minor problem with the pass-side flange had a slight tweak that we had to fix, found this out after we had the stock exhaust off! and the pass header just bearing touched the brake booster. So too late to send back. But I've installed a few sets and this was the first time we had any issues. The Y-pipe bolts to the stock intermidiate pipe. You shouldn't need to do anything special.

Below is a link to an install.

http://www.97transam.com/headers.php

If you want something custom, Mufflex built my Y-pipe, LT headers into a 3" Y with cats into a 4" collector. Looks odd, but it does work great.

http://www.97transam.com/pampered-z/IMG_1134.jpg

RallyBoy

iTrader: (1)

I have heard that the mac cats are very restrictive. How do you feel about this? I thought about buying the cat-less version and installing two high-flo cats in the y-pipe side by side.

SS MPSTR

iTrader: (1)

strongly recommend fabbing some heat shields to protect the fuel lines from the heat of the cat for the drivers side application. those suckers get hot.

Pampered-Z

I don't think cats are that bad, not from what I see people are picking up they can't be that bad. yes, a custom one using large tubes and race cats would probably give you a bit more, buy if you're going that far why use those headers?

I've worked on two cars, the car in the pics with those headers and a 847 cam and Loudmouth, compaerd to another 97 we did: Same cam nearly same convertors, but LE2 heads, long tunes, ORY ( after market exhaust, forget which one? ). 40-45 HP apart. So the Macs must be flowing pretty good.

I certainly did! I didn't like the look of it at all! The lines are wrapped individually with the heat reflective cloth. I went as far as to take it apart and re-sew it all back together so it's nice and tight, then fab'd an aluminum shield and also covered that with the self stick heat sheild as well.

ToxicFormula

I run Mac Mid's with the Mac high-flow CAT and I don't have any problems getting through emissions. I also have the EGR and AIR removed