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  #1  
Old March 14th, 2011, 05:06 PM
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Bill Campbell
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Headers, Dual Exhaust

So anyone out there that runs headers, such as the Hedmen's, what have you done with the rest of the exhaust?

I have some on there and had a y-pipe to a single cat, but that solution sucked and the cat kicked it after about 2 years. I was hoping to go dual cats, dual muffs and straight out the back with the pipes, but it's pretty tight up in there.

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  #2  
Old March 18th, 2011, 02:54 PM
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Bradlee Duncan
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I'm running the block hugger headers from aluminumv8.com with two 2.5" summit racing generic cats to a single 3" dynamax muffler and then out the back using fairly close to stock routing with 3" pipe. It's louder than most would like I'm sure, and I may end up putting a quieter muffler on at some point but it sure exhales a lot better now.

Most cats will need to be at a certain operating temperature to run properly that's why it's technically against the law to put them in any other location/configuration than the stock location/configuration. They need to be close enough to the engine to get up to temperature quickly so that they work properly. If they're not working properly not only will you not likely pass emissions but you'll wear them out faster too as it sounds like you may have experienced.

I played with the dual muffler idea but ended up just going to a larger y-pipe configuration instead to help the breathing.
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Old March 18th, 2011, 04:18 PM
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Quote:
Originally Posted by cbass View Post
I'm running the block hugger headers from aluminumv8.com with two 2.5" summit racing generic cats to a single 3" dynamax muffler and then out the back using fairly close to stock routing with 3" pipe. It's louder than most would like I'm sure, and I may end up putting a quieter muffler on at some point but it sure exhales a lot better now.

Most cats will need to be at a certain operating temperature to run properly that's why it's technically against the law to put them in any other location/configuration than the stock location/configuration. They need to be close enough to the engine to get up to temperature quickly so that they work properly. If they're not working properly not only will you not likely pass emissions but you'll wear them out faster too as it sounds like you may have experienced.

I played with the dual muffler idea but ended up just going to a larger y-pipe configuration instead to help the breathing.
Sounds like a great set-up. Any pixs? What model headers did you use from aluminumv8?

Cheers...
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  #4  
Old March 19th, 2011, 04:48 PM
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Bradlee Duncan
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I don't have any pics at the moment but might be able to get some at some point. I didn't do stainless or anything like that, just aluminized steel.

The headers I used were the 7780 part number ones found here: http://www.aluminumv8.com/catalogpages/headers.htm

They were well built but needed a little tweaking and adjustment to fit around the passenger side motor mount because they're so close to the block.
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Old March 21st, 2011, 01:24 AM
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Bill Campbell
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Quote:
Originally Posted by cbass View Post
I don't have any pics at the moment but might be able to get some at some point. I didn't do stainless or anything like that, just aluminized steel.

The headers I used were the 7780 part number ones found here: http://www.aluminumv8.com/catalogpages/headers.htm

They were well built but needed a little tweaking and adjustment to fit around the passenger side motor mount because they're so close to the block.

Did they come with O2 bungs or did you need to have those installed as well?

B
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  #6  
Old March 21st, 2011, 02:53 PM
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Bradlee Duncan
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No O2 bungs, had to put those in the pipe just before the cats, not in the header portion of the pipes.
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Old March 21st, 2011, 04:30 PM
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Bill Campbell
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Originally Posted by cbass View Post
No O2 bungs, had to put those in the pipe just before the cats, not in the header portion of the pipes.
Did you do all the work yourself or did you have someone weld it up for you?
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Old March 21st, 2011, 04:42 PM
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Bradlee Duncan
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I had a local exhaust shop do it all. It was just mild steel and IIRC it came to about $250-$300 total for the install/fab (I already had purchased the cats, muffler, and headers). So if you're from Utah, I'd recommend JR's custom muffler in Orem :-)
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  #9  
Old March 21st, 2011, 05:00 PM
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Bill Campbell
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Man I wish I was from Utah. Something like that around here would cost quite a bit more I am afraid. I had a guy work up just from the Cats back and he charged me 525. Zing!

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Old March 21st, 2011, 07:11 PM
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Quote:
Originally Posted by cbass View Post
I had a local exhaust shop do it all. It was just mild steel and IIRC it came to about $250-$300 total for the install/fab (I already had purchased the cats, muffler, and headers). So if you're from Utah, I'd recommend JR's custom muffler in Orem :-)
So, overall, are you happy with the headers? Would you do it again on a different 90?
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  #11  
Old March 21st, 2011, 07:15 PM
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Bradlee Duncan
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If I was in a situation where I didn't have the exhaust manifolds, yes I'd do it again. I initially tried the Hedman's but they didn't fit right (similar to the Jayco's) and needed too much modification to get them to go around the starter. So, given the other options, yes I'd do the block-huggers again and get better coating on them.
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