FFR SS Side pipes

[grluisi150]

I'm looking at changing out the FFR SS glass pack side pipes with 24" Slimline pipes. I noticed that everyone is using the 30" pipes. Did anyone use the 24" pipes? is their any drawback in using the 24" vs 30" pipes (besides the obvious 10").

Gary

[wareaglescott]

I used the 30" pipes and am very pleased. Maybe it is not correct but I assumed the 30" pipe would provide more sound muffling than the 24". If you are going through the hassle might as well get maximum sound reduction.

I did have some problems with the J-pipes welds cracking due to the extra weight. The slimlines are quite heavy. I did not come up with the solution but did document what I did in my build thread and they are holding up very nicely now with the additional support. Depending on your setup you may want to check out my solution. Also have some before and after videos with sound readouts.

Good luck with your swap. It is a big difference.

[Avalanche325]

There would be nothing "wrong" with 24". Originals, especially full competition cars has all kinds of different pipes. I assume you are doing it for sound reduction. I needed all I could get.

PUT HANGERS ON, or you will break your headers. I cut the tabs off of my old ones. Shortened them by 1/4" and had my welder put them on the Flowmasters. I had to do a little adjusting, but they are on the original FFR hangers.

[steno]

Hotrod here on the forum built a stunning set of 24” slimlines. I went with the 30” and love the tone. They’re great for conversations while cruising and get good and loud when you step on the right pedal! I’m sorry I waited to do it. 40,000 miles with FFR pipes were enough!

[rich grsc]

I'm looking at changing out the FFR SS glass pack side pipes with 24" Slimline pipes. I noticed that everyone is using the 30" pipes. Did anyone use the 24" pipes? is their any drawback in using the 24" vs 30" pipes (besides the obvious 10").

Gary
10"? I still use the old math, and see a 6" difference. :rolleyes:

[2bking]

I'm looking at changing out the FFR SS glass pack side pipes with 24" Slimline pipes. I noticed that everyone is using the 30" pipes. Did anyone use the 24" pipes? is their any drawback in using the 24" vs 30" pipes (besides the obvious 10").

Gary
The glasspacks welded in the FFR pipes are actually 24" long with 2" inlets and a 4" OD but the weld lines are 20" apart because of the taper of the muffler ends. The 3.5" Pipes hide about 2" on on each end of the original muffler. The Slimlines have 3.5" inlets so there is actually a 10" difference in the weld lines when using the 30" Slimlines hence the 10" comment. The pipes will be about 2" longer after welding in the Slimline but there is ample room between the turn out end and the rear fender flare for the extra length.

[grluisi150]

Guys
Thanks for the feedback. I'm running J pipes and was concerned with the added weight of the 30" slimline pipes. I have been reading all the other post on slimline install and testing and they all use the 30" pipes. I was wondering if the 24" were lighter and would help with the J pipe weld cracking.

Wareaglescott yes I would like to know it their is a difference in sound between the 24 and 30 slimline pipes. Did you have to add additional brackets besides having you J pipes re welded with the standard side bracket?

Gary

[grluisi150]

Wareaglescott
I just found your post with the additional bracket thanks
Gary

[boat737]

Wareaglescott
I just found your post with the additional bracket thanks
Gary

Link?

[grluisi150]

Try this link
http://thefactoryfiveforum.com/showthread.php?21312-Wareaglescott-s-Coyote-build-thread-INDEX-ADDED-TO-POST-1&p=290505&viewfull=1#post290505