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post #1 of 8 (permalink) Old 09-22-2011, 07:22 AM Thread Starter
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Question Stacks - Is water a concern?

I want to run the 5" or 6" MBRP Dual stack setup on my truck. Worried about rain/water collecting in the pipes though. Is this a problem? I'd be running the "Aussie" style...so the tips aren't pointing straight up.
http://www.xtremediesel.com/mbrpinca...variation=2997

http://www.xtremediesel.com/mbrpincc...stipsonly.aspx

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post #2 of 8 (permalink) Old 09-22-2011, 07:54 AM Thread Starter
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Re: Stacks - Is water a concern?

also, how bad does smoke circulate? I spend 99% of my time with the windows down. I'm worried about smoke/exhaust getting sucked back into the cab. This alone will kill it for me if it's bad

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post #3 of 8 (permalink) Old 09-22-2011, 11:32 AM
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Re: Stacks - Is water a concern?

I have had stacks on all of my trucks and the only time smoke got in the cab was when i wasnt moving and the wind was from behind, even then it was minimal. For the water issue, just drill a small 5/16"(or smaller) hole in the Y pipe under each stack and in the elbow from under the bed.

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post #4 of 8 (permalink) Old 09-22-2011, 03:29 PM
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Re: Stacks - Is water a concern?

If you don't cover the stacks in the rain, the next time you start up the truck little black spots will be all over your roof and bed from the soot mixing with the rain water. Other than that, there are no other problems. If you want to avoid this you can either drill a small hole under the Y-pipe, or buy one of those stack covers (not sure if they make them for an aussie though).

I never had a problem with smoke getting in the cab on my last truck.

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post #5 of 8 (permalink) Old 09-22-2011, 04:04 PM Thread Starter
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Re: Stacks - Is water a concern?

I wish I had a truck nearby with stacks so I could compare. I saw 1 truck locally with them, but he was a V-10. Didn't sound right, and his stacks were about 4 ft apart vice being in the bed corners.

I figure the Aussie will prevent probably 75% of any water entry from their angle. Mainly worried about the smoke. glad to hear it isn't really an issue.


how is noise level? I'm cool with rumble and some loudness. But does it get obnoxious or too loud having the stacks right there at the cab?

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post #6 of 8 (permalink) Old 09-22-2011, 04:22 PM
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Re: Stacks - Is water a concern?

I have a miter cut 6" stack right now. I use to have two 5" curved stacks. Rain water gets into the 6" miter cut stack easier because it is pointed straight upward. Never had an issue with the 5" curved stacks. So you'll be good with the aussie style stacks. If you're really worried, just do like said....drill a small hole at the bottom of each 90* elbow for each stack.

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post #7 of 8 (permalink) Old 09-22-2011, 05:20 PM Thread Starter
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Re: Stacks - Is water a concern?

do the drilled holes make any annoying exhaust noises? the clatter from the engine and the stacks themselves will probably kill any extra noise I'm sure. but it never hurts to ask

This is going to be a $700 purchase and I want to make sure I don't end up pissed off with a 5" hole in the bed and useless stacks sitting in the garage

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post #8 of 8 (permalink) Old 09-22-2011, 09:06 PM
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Re: Stacks - Is water a concern?

I have a 7" mitre cut offset from the middle and love it. I've got the hole drilled out in the bottom and it helps a little. On a good rainy day, when you start it up...it WILL give you "black rain".

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