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post #1 of 14 Old 01-16-2011, 04:24 PM Thread Starter
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straight pipe?

i think im guna straight pipe my truck this week how do you do it?? can i just cut my muffler off and use 3.5in flex pipe or can you not use flex pipe for good? and if i straight pipe it when i get on the gas will the diesel growl overpower the turbo whistle or will i still hear a loud whistle? any input would be appreciated thanks!!
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post #2 of 14 Old 01-16-2011, 05:24 PM
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You'll get plenty of whistle.

And yes you can use flex pipe, but make sure it's 3.5 ID. And better do it with a helper because you won't be able to get the tailpipe section back on and the flexpipe connected to it without some help.

Back to the blue oval: 08 F350 FX4 CCLB - DPF/EGR delete - Spartan tuner - S&B CAI - 4 in DP to 5 in SP

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post #3 of 14 Old 01-16-2011, 05:40 PM Thread Starter
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okay this is prob a stupid question but what does id mean? and i was planning on using sawzall and just cutting it right under my truck without taking the tailpipe section off or do i have to take the that off??
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post #4 of 14 Old 01-16-2011, 05:46 PM
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ID = interior diameter.

Not exactly sure if you'll need to take off the tail-pipe section with using flexpipe or not.

2007 F-350 XLT 6.0L PSD Dually 'Jezebel'
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post #5 of 14 Old 01-16-2011, 05:54 PM
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I was using a hacksaw, so I had to cut at the beginning of the muffler and pull out the tailpipe section.

Using a good sawzall, you should be able to just cut the muffler out without removing the tailpipe section. I learned my lesson of why to not buy Harbor Freight tools

Make sure you use good quality pipe connectors. I tried the strap type and it didn't work too well, so I would recommend getting the U-bolt style.

Back to the blue oval: 08 F350 FX4 CCLB - DPF/EGR delete - Spartan tuner - S&B CAI - 4 in DP to 5 in SP

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post #6 of 14 Old 01-16-2011, 06:05 PM Thread Starter
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okay sound good i think il be going to a muffler shop to get the flex and u bolt style clamps thanks for the help. and how much louder is yours after you straight piped it did it make a big difference in sound and turbo whistle? and one more question what is the point of an exhaust tip is it 100% for looks or does it serve a purpose?
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post #7 of 14 Old 01-16-2011, 06:47 PM
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Tips are just for looks. I tried a 5 inch piece of tubing as a tip for a while and it made no difference in sound. Maybe if you with a 4 inch turbo back exhaust with a larger tip at the end.

And for the sound and turbo whistle, the huge grin on your face when you first drive it straight piped will be all the feedback you need

I love mine at about 1800 rpm pulling a hill with a load. Sounds like those big bore Mack V8s

Of course everyone knows stock straight pipe is just the intermediate to a full system later on. I plan on getting a 4 inch downpipe and custom fabbing my system to a single 6 inch stack later on.

Back to the blue oval: 08 F350 FX4 CCLB - DPF/EGR delete - Spartan tuner - S&B CAI - 4 in DP to 5 in SP

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post #8 of 14 Old 01-16-2011, 07:42 PM
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Mine is done it's not too loud in the cab but my truck has 600 lbs of dynomat in it.

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post #9 of 14 Old 01-17-2011, 12:56 AM
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Just order up a section of standard 3.5"
Summit Racing SUM-640035 - Summit Racing® Exhaust Tubing - Overview - SummitRacing.com

And two of the clamps to hold it together
Walker Exhaust 33279 - Walker Butt-Joint Band Clamps - Overview - SummitRacing.com

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post #10 of 14 Old 01-17-2011, 04:46 AM
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I just cut my muffler out with a sawsall and replaced it with flex pipe. I never took the tail pie out. the only problem that I ran into was that the flex pipe has a tendancy to twist a little so i used some #9 wire and wrapped it around the tail pie sectionwhere it humps over the axle housing and attatched it to the frame ( i did it tasetfully). it is stiff enough to keep the tail pipe from rotating. make sure that you use quality exhaust clamps, and get them tight, i check my flex pipe all the time for leaks and havnt found any yet.
Jim

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