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post #1 of 20 Old 03-01-2007, 06:50 PM Thread Starter
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Stack Question

I was wondering if Josh or anybody that has Grand Rock stacks could tell me what size holesaw I need to get to make the hole in my bed. Also Id like to give credit to Grand Rock for making an awesome looking kit!!! The fit and finish on this is second to none, and the clamps look great. If someone could help me out ASAP I would appreciate it cause I am dyin to get these bad-boys on!!!!! thanks
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post #2 of 20 Old 03-01-2007, 07:05 PM
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I would think 1/4 inch bigger than the pipe od.

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post #3 of 20 Old 03-01-2007, 09:14 PM
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the pipe that goes into the bed is 4 inches i was going to drill the hole a 1/2 inch bigger. you can use a jigsaw easeier and cleaner cut i think. or unles you wanna buy a 5 inch hole bit from home depot fro 50 bucks to only use 1 time lol.

CB Radio- General Lee
7.3l 99 f-250 SD
4 INCH TURBO BACK TO 6 INCH MITER CUT STACKS CURIOSTY OF GRAND ROCK AND COWBOY DIESEL PERFORMANCE.
TS 6 POSTION CHIP. stock,high idle,50,75,100,140hp.
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post #4 of 20 Old 03-02-2007, 06:02 AM Thread Starter
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Originally Posted by strokermann View Post
the pipe that goes into the bed is 4 inches i was going to drill the hole a 1/2 inch bigger. you can use a jigsaw easeier and cleaner cut i think. or unles you wanna buy a 5 inch hole bit from home depot fro 50 bucks to only use 1 time lol.
Yeah I was thinking about going with the jigsaw but I think If I use the holesaw it will be a cleaner cut and eventually down the road if I decide to change my mind I am hoping that I could have that it would be easier to have it welded back in. Now my cousin has mbrp smokers and he said that a 4 1/2 inch holesaw worked perfect for him, but I am not sure if the thru-bed pipe is the same on both kits
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post #5 of 20 Old 03-02-2007, 06:34 AM
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if i remeber all the kits are the same and the t-pipe going through the bed is 4 inches. then it goes up to 5 inches if that is what you bought.

CB Radio- General Lee
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4 INCH TURBO BACK TO 6 INCH MITER CUT STACKS CURIOSTY OF GRAND ROCK AND COWBOY DIESEL PERFORMANCE.
TS 6 POSTION CHIP. stock,high idle,50,75,100,140hp.
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post #6 of 20 Old 03-02-2007, 07:55 AM
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Just remember the U-Bolts in the kit are supposed to be bolted to the truck bed. This helps with supporting the stacks! I usually suggest (and we'll be having new installation instructions here soon I hope) to use a 4" hole saw maybe a little bigger. Place the Y-pipe in the truck bed with the y-pipe in the hole, take a marker and trace around the rest of they Y-pipe. This way the Y-pipe will sit on the U-bolts like they're supposed to. I hope this helps. By the way thanks for the compliments on the kit, I'm glad to hear you like the kit. We use ONLY the best clamps, and materials in out systems.
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post #7 of 20 Old 03-05-2007, 06:06 PM Thread Starter
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Thanks for the help josh. Me and my buddy got r done this weekend. I didnt know that he had a plasma cutter, so we just used that. I didnt mount the u bolts through the bed. I made some standoffs for it and welded them to the bed and bolted the ubolts through those. I just didnt want to drill out the bed anymore, and the real reason is because my truck is lifted and I wanted the stacks to be seen by oncoming traffic . It worked perfectly they are about 3 inches above the cab. I will post up some pics of it tomorrow.
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post #8 of 20 Old 03-05-2007, 06:22 PM
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yeah lets see some pics!

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post #9 of 20 Old 03-06-2007, 01:27 AM
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Pics, we need pics.

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post #10 of 20 Old 03-06-2007, 03:42 AM
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Quote:
Originally Posted by 4D_M8sit_InTrNtNlSh8ks_IT View Post
Thanks for the help josh. Me and my buddy got r done this weekend. I didnt know that he had a plasma cutter, so we just used that. I didnt mount the u bolts through the bed. I made some standoffs for it and welded them to the bed and bolted the ubolts through those. I just didnt want to drill out the bed anymore, and the real reason is because my truck is lifted and I wanted the stacks to be seen by oncoming traffic . It worked perfectly they are about 3 inches above the cab. I will post up some pics of it tomorrow.

Well you're welcome, and I'm glad to hear you and your buddy got em in! Now (like everyone else) LET'S SEE SOME PICS.!!!!!!!!!!
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