just curious if the mac y pipe and the high flow cats are worth buying for the LS1..iam thinking about buying it..i already have the slp loudmouth exhaust on my car..any comments on the mac y pipe and the high flow cats? thanks

 

I've heard 20-25 RWHP with the MAC's and off-road pipe.They're what I plan on going with when I get some more $$$ for mods.
Kevin

Edit:I've heard that the MAC cats suck.You can have a custom Y-pipe made for around $200 with better cats though.

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1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,Manual Fan Switch,and Dynomax Cat-back

BMR STB and Sub-frame Connectors

Pics

[This message has been edited by nikkev (edited July 13, 2002).]

 

20-25 rwhp out of a Y-pipe and high flow cats?? sounds like you could work for SLP, aka, the masters of optimism. imo, high flow cats are a waste of valuable money, so just with an off road Y,X,or H pipe. you *MAY* see 5-7rwhp at the most.

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1999 Camaro SS A4 Black/Black/Dark Gray w/ Torch Red Hood Scoop and Torch Red Rear Stripe... 3:23 || SLP Loudmouth || SLP AirBox Lid w/ K&N || SLP Bowtie Grille || SLP CAI || SLP SFC || SLP STB || AZP&S Adjustable Fuel Pressure Regulator w/ 3psi Boost || Sullivan Aluminum Racing Pedals || Yank ST3500 || B&M 24K Tranny Cooler || Jet-Hot Hooker LT Headers w/ ORY || Hypertech 160 T-Stat || SLP Fan Switch || 17 x 9.5 Aluminum Z06 Wheels || Nitto 555R's || Macewen White Faced Gauges w/ Red Dash Bulbs || Xenon Headlights.

 

Uhhh ... you want to go back and re-read the post ... They're talking about getting the Y-pipe with the headers.

Headers and Y-pipe can give you gains in the 20 range, but not with cats. You'll have to go ORP Y-pipe to see those gains. You should expect gains in the 10-15 range on a stock motor with cats.

But I do agree that a y-pipe in and of it self isn't worth it. I'd wait until your going to do headers and do the Y-pipe then.

As for the MAC cats. They don't neccesarily suck, they are about the same as stock. And for that matter all cats are a flow restriction.

Go sans cats for maximum gain and either buy headers with swapable a cats/race pipe set up or have one custom fabricated.

Good Luck

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'01 Mystic Teal Z28
A4/3.23/Leather/T-Tops
Mods List Here

12.38/110.72/1.74 60'
325 rwhp/341 rwtq
www.MysticZ28.com

NorCal LS1/LT1

"To play it safe is not to play"

[This message has been edited by V6toZ28 (edited July 14, 2002).]

 

Hey,V6toZ28,how do you like that stall you have listed?I'm looking at the Yanks for my car and their page says I should go with the ST3500 but I think that may be a bit much.How much did your 3200 help?Thanks.
Kevin

PS
Yes,I was talking about headers and a y-pipe.As far as just a y-pipe goes,I would wait.If you are just really,really wanting one then I think it's cheaper to have one made at a local muffler shop than buying one and having it shipped.Good luck.

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1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,Manual Fan Switch,and Dynomax Cat-back

BMR STB and Sub-frame Connectors

Pics

 

nikkev ... I sent you an e-mail, rather than hijacking this guys thread.

 

Go with long tubes, especially if you plan on other mods like cam, ect
and ditch the cats,
my .02

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//BLACK 99 SS//M-6//T-Top//TR 224/224 .561/.561 112LSA//CNC Stage 2 Heads 2.08"Intake-1.60" Exhaust Valves//Volant Cold Air Induction//BBK 80mm Throttle Body//SLP Stage 1 Suspension Kit// Powerslut Rotors//Hawk Pads//Mosser 12 bolt-4.10 Gears//SPEC Stage 3 Clutch//ASP Underdrive Pulley//Lingenfelter Aluminum Driveshaft//BMR Sway Bars-Lower Controll Arms-Panhard Rod-Track Pak-Strut Tower Brace//Taylor Wires-NGK plugs//HPP 3-160 Stat//Skip Shift Eliminator//B&M Ripper Shifter//SLP LT Headers-SLP ORY No Cats//Borla Cat Back//Dynomax Bullit//ECT...