Are the Mac Mid-Length Headers worth getting, because I've heard that shorties are just as good as the stock manifolds. Long-tubes are not an option, because I'm going to lower the car, and i don't want to srape ANYTHING! How much help is the Off-road y-pipe? Are the cats high flow? And will any of it pass smog?

-Jeff

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1998 NBM Z28, A4 2.73, Chrome 10-spoke SS rims, RK Sport ground effects, QTEC, Flowmaster, CAI, LS1 Motorsports Lid, K&N, MSD wires, custom painted interior.

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Best ET: 13.665 @ 103.25
Best 60': 2.114
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Yep..MAC headers are well worth it. I have them with the off-road on my SS. We picked up 22rwhp with that setup. You'll get more HP with an off-road compared to cats. The off-road will not pass smog though (since you will not have any cats). Hope that helped some.

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what about the Mac Headers with cats and y-pipe? Will they pass smog?

I heard that the Edelbrock Mid-length headers and y-pipe are the easiest to install on an LS1, but performance wise, how do they compare to the Macs?

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1998 NBM Z28, A4 2.73, Chrome 10-spoke SS rims, RK Sport ground effects, QTEC, Flowmaster, CAI, LS1 Motorsports Lid, K&N, MSD wires, custom painted interior.

**On Order:
SLP Ultra-Z Ram Air Hood. **

Best ET: 13.665 @ 103.25
Best 60': 2.114
Best reaction : 0.649

 

I'm almost sure the MACs with cats will pass..not certain though. I don't have any experience with the Edelbrock headres. Maybe someone can chime in with info on those.

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President/Co-owner of Dynamic Motorsports, LLC (DMS)
"Leaving the competition behind..."

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Email: eric@dynamicmotorsports.com

- A performance company by performance enthusiasts FOR performance enthusiasts!

WE WORK TOWARDS HELPING YOU, NOT TOWARDS MAKING MONEY!

 

Anyone know what the power gain is on Mac Headers and Cat-y-pipe?

And what about the Edelbrocks? Anybody have those? Anyone have hp #s?

-Jeff

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1998 NBM Z28, A4 2.73, Chrome 10-spoke SS rims, RK Sport ground effects, QTEC, Flowmaster, CAI, LS1 Motorsports Lid, K&N, MSD wires, custom painted interior.

**On Order:
SLP Ultra-Z Ram Air Hood. **

Best ET: 13.665 @ 103.25
Best 60': 2.114
Best reaction : 0.649