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SLP New headers or ARH?

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Old 03-07-2009, 11:10 PM
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Default SLP New headers or ARH?

Hi guys, I'm about to buy headers for my 99 formula, can't decide what header to go with. I want to go catted-y set-up, either American Racing with catted-y, or SLP new design headers. Both these headers seem very similar, and the price is about the same, and if I went American Racing, would it hook into an SLP cat-back exhaust loudmouth 1? Thanks.
Old 03-07-2009, 11:25 PM
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I'd go ARH. Then sell the LM1.
Old 03-07-2009, 11:28 PM
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Well, the SLP's are nice because you get coating with the price. But, the ARH come with merge collectors and the SLP's do not. The ARH y-pipe is a little better IMO just by looking at it, but I've never handled either of them in person.

The price is a moot point since they're roughly the same. Ask yourself what you'd rather have: coating or merge collectors. Based on your answer, make your decision.
Old 03-08-2009, 01:19 AM
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Go ARH... SLP with their bad customer service and "nose in the air" attitude for the past years has really steered me clear of their business...
Old 03-08-2009, 09:14 AM
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ARH for sure mine slid right in
Old 03-08-2009, 09:41 AM
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ARH and don't look back.
Old 03-08-2009, 10:07 AM
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I have SLP with Catted y-pipe into SLP LM1 and It sounds good to me. It is very loud, but I like it. As far as making a decision, I would do as the OP said. Stainless with ceramic coating or the merge.
Old 03-08-2009, 12:12 PM
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Wouldn't the coated SLPs give off less heat?
Old 03-08-2009, 12:33 PM
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another vote for ARH
Old 03-08-2009, 01:06 PM
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Originally Posted by HMERacing
I have SLP with Catted y-pipe into SLP LM1 and It sounds good to me. It is very loud, but I like it. As far as making a decision, I would do as the OP said. Stainless with ceramic coating or the merge.
Thanks for posting, I was wondering if you have any sound clips of your setup? I'm just wondering how much louder your car got from when you had your loudmouth 1, and when you added your SLP new headers. Thanks.
Old 03-08-2009, 01:07 PM
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Thank you for everyone who replied, I'm leaning towards ARH because I like their merge better, and their catted-y.
Old 03-08-2009, 02:06 PM
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http://www.cardomain.com/ride/3022039

There are videos of it. I went from stock to cutout to SLP headers/cats/ypipe/cutout/stock ws6 catback to Full SLP exhaust. But on my 98 SS I had stock manifolds/cats/ypipe with loudmouth and loved it. My WS6 setup is quite a bit louder than the SS.
Old 03-08-2009, 02:12 PM
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I had ARH catted LT's and a TSP rumbler which is basically the loudmouth. It sounded like ****. Way too raspy and loud. It only sounded good idling and above 4k RPMS. Your probably going to want a regular muffler on the system to clean up the sound, like the hooker or magnaflow catbacks.
Old 03-08-2009, 04:20 PM
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I'm gonna say ARH with either system with the loudmouth it's gonna be LOUD. You could always put a bullet muffler in the LM. If you need help or have any questions shoot me a PM
Old 03-08-2009, 05:00 PM
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I am uncertain of difference in LM1 and LM2, but I had the original LM for my formula with Kooks headers and catted y, and it sounded like a post above, awesome at idle, but at some parts at WOT would just be way to raspy and was EXTREMELY loud especially if you got a manual and letting it wind down. LOL

I'm definitely gonna go with ARH as soon as the $ comes available.
Old 03-08-2009, 05:31 PM
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Originally Posted by HMERacing
http://www.cardomain.com/ride/3022039

There are videos of it. I went from stock to cutout to SLP headers/cats/ypipe/cutout/stock ws6 catback to Full SLP exhaust. But on my 98 SS I had stock manifolds/cats/ypipe with loudmouth and loved it. My WS6 setup is quite a bit louder than the SS.
Thanks for the video! your car sounds great.
Old 03-08-2009, 05:49 PM
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Originally Posted by Tom@ARH
I'm gonna say ARH with either system with the loudmouth it's gonna be LOUD. You could always put a bullet muffler in the LM. If you need help or have any questions shoot me a PM
Thanks for posting! how much hp are these headers good for with the
catted y pipe? right now I am making 327 rwhp and 343 tq once I get
these headers on I will get my car tuned again. Thanks.




1999 formula m6 slp catback loud mouth 1, ls6 intake, slp ram air tune
327 rwhp 343 tq.
Old 03-08-2009, 07:02 PM
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I had the loudmouth 1 with the new SLP Y without headers, then I installed the ARH with their catted Y into the loudmouth 1 which in my opinion took out the rasp and drone that so many complain about. I love the ARH with their catted Y. This thread I'm posting for you was my thread in how pleased I was and am with the quality of the ARH. There are 2 sound clips soon as the headers were installed, and 2 sound clips going down the road while inside the car. I was not at wot, and shifting was done easy.
https://ls1tech.com/forums/generatio...installed.html
Old 03-09-2009, 05:00 PM
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Your firehawk sounds great thanks for posting! I sold on ARH headers!
Old 03-09-2009, 05:18 PM
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Originally Posted by Soul TKR
Go ARH... SLP with their bad customer service and "nose in the air" attitude for the past years has really steered me clear of their business...
Originally Posted by Tom@ARH
I'm gonna say ARH with either system with the loudmouth it's gonna be LOUD. You could always put a bullet muffler in the LM. If you need help or have any questions shoot me a PM
+1 on both, you definitely cannot beat ARH!
The fit & finish on the ARH's is second to none...as for the SLP's, well they had to 'improve' on their original horrible/low-hanging/lengthy install header design.
Customer service is a huge attribute as well, when was the last time you seen SLP posting???

Personally, I find most of SLP's stuff wayyy over priced and much better products can be found for the same or less out of pocket


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