85transamtpi

I cant remember where it was, but I saw a post from either Tom or Larry from Speed, Inc. saying on mild cars the difference between macs and slp's is normaly 8-10rwhp. The difference was larger on head/cam cars.

This is off the top of my head, so if Im wrong sorry.

-Doug

Trevor @ Texas Speed & Perf.

iTrader: (3)

I'd go with a set of Macs way before I went with SLP's spaghetti headers. They'll easily make the same power as the SLP's (maybe a little more???), and you'll be able to pick a used set up for cheap.

JaSSon00

HOW WOULD MACS BE ABLE TO PROVIDE MORE HP THAN THE SLP'S? I JUST DONT UNDERSTAND THE REASONING BEHIND IT, JUST BECAUSE THE SLP HAS A SPAGHETTI LOOK DOESNT MEAN THAT THE MACS ARE SUPERIOR, DONT KID URSELF, THE SLPS WILL MAKE MORE POWER, BOTTOM LINE. MAYBE 1 MORE HP, MAYBE 10 MORE BUT THEY WILL MAKE MORE. MY .02

thxone

iTrader: (1)

I have SLP LT's and I increased my e.t. and mph, with no other mods. I increased my mph by 2.5 to 3 mph on average, so they do deliver on H.P.. But the biggest reason to buy them is life-time warrarty and all stainless steel construction.

rick

I can't help but roll my eyes at the naysayers who keep putting down SLP headers, when time and time again, they show to perform as well if not better than other headers at the track.

BLK00TA

iTrader: (9)

I HAVE A 2000 RAM AIR. I HAVE A LIS, MASS AIR. IM ALSO LOOKING IN TO GETTING A CAM. WITH THIS SETUP IS SLP LT HEADERS GOING TO MAKE ALOT MORE RWHP THANS THE MACS OR IS THE HP DIFFERENCE GOING TO BE SMALL.I AM ON A BUDGET ALSO.

WILWAXU

iTrader: (6)

Mac's are a great bang for the buck. But, there are a few new headers on the market that are looking good.

Greg Fell

iTrader: (9)

I agree, its area under the curve that makes better ET's. Think about it, its not always about the biggest exhaust, you must have the correct back pressure. a 5 inch pipe could flow more air than a 3 inch pipe, but would kill your power. same goes here. for street cars that are not ultra high rpm all the time, the slp's cannot be beat. quality, power, price, etc.

WILWAXU

iTrader: (6)

LOL.. Umm.. what Naysayers? Nobody put down the SLP headers.. The questions was which is better for the price. That's the MAC's.

I personnaly like the SLP headers.. but if cost is a concern.. then they are far from the top of the list.

KillerD

iTrader: (2)

I think personally you should go with the SLP headers. I believe there are better for you in the long run. If you save money now but sacrifice power with the Macs then you know you are not getting the potental the LS1 has with those but they are cheaper. With the SLP headers being equal length (not sure if the macs are or not but dont think so) and tuned then those are the better ones to get and you will a better HP increase from all your other mods also. IMO go with the SLP's!

Mike

TA_2001

macs are the cheapest.. I went with SLP due
to quality of contruction, price was not a factor.

85transamtpi

I'll be the first to say they'd (SLP)probably be a MAJOR pain in the @ss to install. Ive never done it but I can imagine how bad it would be. The macs on the other hand look like they'd fit right in.

-Doug

BYE RICE

iTrader: (2)

I assume the MAC's in question are mid-lengths.
A full length "tuned" header will always make more power.But there are advantages to a mid-length,such as improved ground clearance.Full length headers can be a real pain in *** to live with on a daily-driver.I can now change a flange gasket 20 minuites!

JaSSon00

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 85transamtpi:
<strong>I'll be the first to say they'd (SLP)probably be a MAJOR pain in the @ss to install. Ive never done it but I can imagine how bad it would be. The macs on the other hand look like they'd fit right in.

-Doug</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">well doug, i have installed a set and i will tell u that the installation was simple. it was my first header install ever and i did it in the drive way, i can honestly say that flp's, macs, etc. could not have gone in any easier than the slp's, all the hype around the slp fitment issues is just that, hype. dont knock it till u have done it,......

jasson

Benjamin Russick

iTrader: (1)

MACs are cake to install...both will go in from the top. You will lose a little bottom-end, but they shine up top. DO NOT get the MACs with cats...they suck. I had a custom Y with better cats made. Car really shines from 4500 up. I will still use them with my upcoming heads/cam. Bang-for-the-buck only the Hookers are close.

Mike K.

SLP's aren't bad price wise cause if you get the aftermarket race pipes and skip the cats,, I think the main reason to get these headers is because of the longevity of them, stainless and coated which no other header is, they will all make around the same amount of hp so if you don't want them to rust and can spend the extra $'s then go with the SLP's,, if not go with the macs, BTW my SLP install was harder than my cam install but now that I have done it once I think I could do it much easier now,, my only stuck point happened on the drivers side header and I had to take out the steering knuckle to get it to fit in.

NastySSoo

I think SLP, MACS, FLP all make great headers. I gained as much from my Macs as my buddys with the others. All the talk about long tube and mid length is blown out of proportion IMO> If there is a difference, it is very subtle. My mph gains at the track speak for themselves> I also have no problems with the quality of the Macs.

Paul

99 Black Bird T/A

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 85transamtpi:
<strong>I cant remember where it was, but I saw a post from either Tom or Larry from Speed, Inc. saying on mild cars the difference between macs and slp's is normaly 8-10rwhp. The difference was larger on head/cam cars.

This is off the top of my head, so if Im wrong sorry.

-Doug</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Saw a dyno test of MAC's (flowmaster Y, cleaned up primaries, no cat's) on a bolt on car that made about 10 rwhp more on the top end than the SLP's did.

The SLP's made about 10rwtq more than the MAC's down low and in the mid-range.

The car's owner stated the car gained 1 or 2/10's at the track with the SLP's over the MAC's. The car was a convertable so the extra torque probably really helped.

Mid-lenght design MAC header with the 1 3/4 inch design primary of the MAC will make as good top end power as the SLP or probably better with a good collector and the normal MAC mod's.

Long Tube designs like the SLP with the 1 3/4 inch design primary will make better torque than the Mid-lenght and similar to slightly lower top rpm hp.

With that said, if money isn't an issue, I'd probably take the SLP's over the MAC's as the SLP's sound good and make more extra power where a "daily driver" bolt on car uses it.

If the car is mainly for the track and/or money is an issue, the MAC's can do just about as good for less cash. With a heads and cam set up that favors peak numbers, I'd take the MAC's.

Both product's have their niche and both can be the best depending on the intended application.

<small>[ April 22, 2002, 08:59 PM: Message edited by: 99 Black Bird T/A ]</small>

mykdiver

I would get MACs, and the T1 cam from MTI. Best bang for the $, if you have $ get FLP headers they are the best. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />