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4" vs 5" Straight Pipe
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Senior User
Joined: Jun 2014
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4" vs 5" Straight Pipe
Hey guys. Buying an 06 6 liter tomorrow that was studded and deleted at the dealer along with a bunch of other work Buying it from the original owner. First thing I'll be doing is a straight pipe, but I can't decide. I've heard only 4" really in person. Some people say the 4 is more grumbly than the 5? If anyone has recommendations or videos comparing them please post them. Looking at a diamond back 5" (pretty cheap) or an MBRP 4". Thanks
Posting Guru
Joined: Apr 2015
Posts: 1,817
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From: Yakistan, WA
Hey guys. Buying an 06 6 liter tomorrow that was studded and deleted at the dealer along with a bunch of other work Buying it from the original owner. First thing I'll be doing is a straight pipe, but I can't decide. I've heard only 4" really in person. Some people say the 4 is more grumbly than the 5? If anyone has recommendations or videos comparing them please post them. Looking at a diamond back 5" (pretty cheap) or an MBRP 4". Thanks
The DEALER did delete work? What did they delete? If it was emissions deleting then that is rare. I cant find anybody here in Yakima, WA that will do delete work, that is reputable at least, everyone tells me that I have to do it myself.
I had the 3.5" down pipe with 4" straight pipe cat back on my '04 6.0L PSD, and I had it dumped out before the passenger rear tire. It was VERY loud, and got everyones attention just idling in parking lots, or cruising the town. For me this was the best route.
Thread Starter
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Senior User
Joined: Jun 2014
Posts: 102
Likes: 0
The DEALER did delete work? What did they delete? If it was emissions deleting then that is rare. I cant find anybody here in Yakima, WA that will do delete work, that is reputable at least, everyone tells me that I have to do it myself.
I had the 3.5" down pipe with 4" straight pipe cat back on my '04 6.0L PSD, and I had it dumped out before the passenger rear tire. It was VERY loud, and got everyones attention just idling in parking lots, or cruising the town. For me this was the best route.
I had the 3.5" down pipe with 4" straight pipe cat back on my '04 6.0L PSD, and I had it dumped out before the passenger rear tire. It was VERY loud, and got everyones attention just idling in parking lots, or cruising the town. For me this was the best route.
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Posting Guru
Joined: Apr 2015
Posts: 1,817
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From: Yakistan, WA
If and when I do the exhaust my 6.oh, this time I will keep the stock piping and only delete out the CAT and muffler.
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
my diamond eye 4" system came with a 4" downpipe. was tight, and had a factory-made clearance dimple in one spot, but it fit.
Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
I would personally, never buy diamond eye again in my life. Not to say every item they have is bad, but i had a bad experience with their pipes not being flared enough, sucked to put it together, and get it to fit well enough to not rub on the transmission fill tube.
I got the 4" dp to 5" straight, not incredibly loud, most straight pipe NA v8s are louder. i did have to scrape at my firewall a bit for the down pipe, and drink a few beer inbetween or else i would have threw it in the scrap bin
I got the 4" dp to 5" straight, not incredibly loud, most straight pipe NA v8s are louder. i did have to scrape at my firewall a bit for the down pipe, and drink a few beer inbetween or else i would have threw it in the scrap bin
