Muffler and cat delete pipes

powerstrokelizzie · Jan 18, 2015

im not looking to make big power, and be super loud, just open my exhaust up a bit. My truck is a 97, super clean and never molested.

Im looking at doing an intake, and a 4 inch downpipe. I don't really see the need to go with an MBRP exhaust, when I can just open up my stock exhaust.

Ill start off by deleting the cat (which I suspect may be clogged) , and if its not too crazy loud I may delete the muffler just to make it flow better.

Anyway, heres my Question. I could go to the local metal yard, and just buy some 3.5" straightpipe, but I remember seeing delete pipes that looked neatly setup, but I cant find them now. They were alittle bit more expensive, but id prefer a neat setup and being able to just unclamp it and re-install the cat if I ever have too.

Basically, it was just a regular pipe, cut to length, and on either side it had a bell end. and a slits cut it in. So that way you just cut off the cat, slide the delete pipe on (maybe the cat had a flange on one end, and the muffler delete had bell ends on both sides) and use one clamp on each side. I forget how much it was, but it was less then $100.

All I could find now, is just a section of pipe, that requires adapters on both sides, and either welded on, or 4 clamps total to install, and that's not very neat if you ask me. Not to mention the prices are way up there, when I can go to the metal yard and buy the same darn pipe for less then $10

If anybody knows what im talking about please let me know! And if not, ill find a better way to explain it

wrench junky · Jan 18, 2015

Have you found a 4" dp for an obs truck? I didnt think they made them bigger than 3 or 3 and a half because they wont fit without a body lift and modifying the firewall. But if your not goin for big power why would you need a 4" or larger dp? And the 4" inch wont gain you a whole lot with just intake and an opened up exhaust.

Bugman · Jan 18, 2015

You won't find a 4" or 3 1/2" down pipe for a OBS truck. You can find them that will bell out to 4" or 3 1/2" after the pinch weld where you can directly attach the rest of the pipe.

boostedretard · Jan 19, 2015

If your going to use clamps pass on the muffler clamps and gets some good quality band clamps. They seal really well. Napa or and auto part can get them in aluminized or stainless. 3" is plenty for most basic setups. Any exhaust shop will sell you a length of pipe over the counter. They can also expand the pipe to slip fit.

Bradbilt · Jan 19, 2015

Do yourself a HUGE favor and just buy a Turbo back system. And I would also PASS on MBRP(I had nothing but problems with them)

I do suggest Flo-Pro STAINLESS. You can get the Muffler delete kit(come with cat delete pipe too) for $328 shipped to your door. SS821NM Stainless 4 Turbo Back Single Fits 94-97 Ford F250/F350 No Muffler (that is a 3" Down pipe)
Or go with the muffler system for $356 SS821 Stainless 4 Turbo Back Single Fits 94-97 Ford F250/F350 With Muffler That is what I have on my truck and the muffler helps take the crackle out of it at higher RPMs

I also agree with boostedretard, throw the u-bolt clamps in the scrap pile and buy band clamps

Fordlover94 · Feb 4, 2021

Bradbilt said:
Do yourself a HUGE favor and just buy a Turbo back system. And I would also PASS on MBRP(I had nothing but problems with them)

I do suggest Flo-Pro STAINLESS. You can get the Muffler delete kit(come with cat delete pipe too) for $328 shipped to your door. SS821NM Stainless 4 Turbo Back Single Fits 94-97 Ford F250/F350 No Muffler (that is a 3" Down pipe)
Or go with the muffler system for $356 SS821 Stainless 4 Turbo Back Single Fits 94-97 Ford F250/F350 With Muffler That is what I have on my truck and the muffler helps take the crackle out of it at higher RPMs

I also agree with boostedretard, throw the u-bolt clamps in the scrap pile and buy band clamps

Does your truck have dual tanks because mine does and I was wondering if the flo pro system would fit

Nodge · Jan 23, 2015

Diamond Eye 3 5 Cat Delete Pipe 94 97 Powerstroke 7 3L | eBay

Get the matching down pipe, bolt them both in, and leave the stock muffler. That's what is on one of my 7.3's and I prefer it over other full exhaust kits I have used on other trucks.

csp · Jan 23, 2015

A muffler delete does nothing. I tried it. No difference in power or sound.

old man dave · Feb 4, 2015

Probably true on a pretty much stock truck. Not so with an injected truck.

csp · Feb 4, 2015

Assuming you mean larger injectors, since they are all injected.

Still made no seat of the pants or sound difference with mine.

DieselFreak92 · Feb 4, 2015

If you delete them muffler and keep the cat you will notice no difference In sound.

old man dave · Feb 8, 2015

The cat is the most restrictive point in the OBS exhaust system.

JCart · Feb 8, 2015

Nuther option is to install down pipe, remove cat and knock stuffing out re-install and remove muffler, or leave muffler on. 4" or larger exhaust will not make appreciable difference till after you install larger injectors and get close to 400 RWHP.

jrc

Muffler and cat delete pipes

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