MAC Header bolt question

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Sep 2, 2008 | 02:32 PM

PMCSPIDER

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From: Houston, TX

MAC Header bolt question

Hey guys,

I just picked up the MAC Header + Y=pipe set-up for my 2001 WS6 M6, and I need to pick up new bolts to install them. Does anyone know what specification bolt I need? Here is the link to the specific Mac system I am referring to:

Part #TF4420

http://www.macperformance.com/store/...ategory_ID=569

Sep 2, 2008 | 05:09 PM

PMCSPIDER

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Bump...Little help here.

Are the bolts I need any of these?

http://www.thunderracing.com/catalog...d=222&pcid=301

Sep 2, 2008 | 05:38 PM

krazy4

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From: Yorba Linda, CA

Do you need the bolts that connect the headers to the Y-pipe or just the bolts to bolt them up to the the exhaust ports?

If it is the second one you can just re use the stock bolts.

Sep 3, 2008 | 08:53 PM

PMCSPIDER

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Quote:

Originally Posted by krazy4

Do you need the bolts that connect the headers to the Y-pipe or just the bolts to bolt them up to the the exhaust ports?

If it is the second one you can just re use the stock bolts.

I have heard its not a good idea to re-use the stock bolts. Bolts are relatively inexpensive compared to the overall exhaust system.

I need all the bolts that connect the headers to the engine block. I am not sure if the Mac Y-pipe I picked up came w/ hardware or not, but just incase, let me know if you can what size and specification I would need.

I also heard I can just go to a GM dealership and p/u a set of new exhaust manifold bolts. IDK what im gonna do, b/c I have seen websites with after-market (superior) bolts that are under $40 a set...like in the link a posted on this thread the other day.

Your thoughts?

Sep 3, 2008 | 09:37 PM

DrkPhx

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From: St. Michael, MN.

Reuse the stock bolts and they will work just fine. Or buy a new set from a local dealer, no need to spend $40. I ran MAC headers with the original headers bolts for a few years with no problems. I do recommend adding a Flowmaster merge to the Y pipe and also grinding the welds on the inside of the primaries to help a little with flow.

Sep 3, 2008 | 10:19 PM

krazy4

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From: Yorba Linda, CA

The stock bolts will work fine.

Sep 3, 2008 | 10:21 PM

Formulated

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From: Moorpark, CA

Ditto. I reused the stock bolts. Much better, actually, than the aftermarket bolts that came with my header. Fit was better, and bigger flange under the bolt head.

Stockers are the best I've seen.