4 inch or 5inch

bigcountrysg · Jun 6, 2011

Here is the thing once my truck is back up and running. I am getting new exhaust. I already have 4inch straight pipe turbo back. But the shop my truck is at offered me 5inch exhaust mandrel bend from the down pipe back for 300 installed. So now I am curious if I should go with this or do the 4inch back again.

Big Bore · Jun 6, 2011

I had 5 inch dp back on the 96 and I loved the sound, nice mellow rumble from inside the cab. Apparently could be heard coming from blocks away even when not on the throttle.LOL

02BigD · Jun 6, 2011

Big Bore said:
I had 5 inch dp back on the 96 and I loved the sound, nice mellow rumble from inside the cab. Apparently could be heard coming from blocks away even when not on the throttle.LOL

This, just in my '02. On my way to Rudy's, David N heard me coming up from behind them on the left side of my truck (my exhaust is single out passenger side, and yes they were driving slow in the left lane) with their windows up. Highway speeds, he has a CCSB 7.3. I was running 85 or so. 2300 RPMS just sounds sick.

DcMoore · Jun 6, 2011

5 inch! I have 5 from the down pipe to a 7 inch single.. Sounds great.

Tom S · Jun 6, 2011

Big Bore said:
I had 5 inch dp back on the 96 and I loved the sound, nice mellow rumble from inside the cab. Apparently could be heard coming from blocks away even when not on the throttle.LOL

Yes that truck had tons and tons of whistle.

jwlandry · Jun 6, 2011

i have a 5'' and love the sound.

average · Jun 7, 2011

5" no muffler sounds amazing.

Big Bore · Jun 7, 2011

average said:
5" no muffler sounds amazing.

Especially in a manual trans truck. The whistle down between gears is very big rig like. I often wondered how a 8" tip would sound on the 5" exhaust.

vanderchevy18 · Jun 7, 2011

Cale has a 7 or 8 inch tip. I can't remember which. Anyway, his sounds pretty good. Its just a little surprising to see that giant sucker under there! Haha!

powerstrokenstang · Jun 7, 2011

i kinda wish i would have got 4". 5" sounds great but doesnt clear stuff well while towing.

Cat_rebel · Jun 7, 2011

4" is all you "need", 5" just looks & sounds better.

lincolnlocker · Jun 7, 2011

average said:
5" no muffler sounds amazing.

:whs: don't need it, really only changes the sound, so if you wanna spend the 300 then go ahead

lincolnlocker · Jun 7, 2011

cat beat me to it:doh:

vanderchevy18 · Jun 7, 2011

At the dyno shop a 6" long 4" 90 was taped to my 4" exhaust with copious amounts of aluminum tape to route smoke out the door. During 3/4 to almost full throttle that 90 was blown off and hit the wall with enough force to bend the hell out of the end of the pipe.

I'm going with 5".

lincolnlocker · Jun 7, 2011

vanderchevy18 said:
At the dyno shop a 6" long 4" 90 was taped to my 4" exhaust with copious amounts of aluminum tape to route smoke out the door. During 3/4 to almost full throttle that 90 was blown off and hit the wall with enough force to bend the hell out of the end of the pipe.

I'm going with 5".

. Guess you know how much a bend can restrict it. That's the first I've heard of something like that. That's crazy.

bigcountrysg · Jun 7, 2011

Doesn't matter right now anyways. My engine maybe done. Tomorrow I will be pulling my cylinder head off. But first I am going to look at a F-150 4x4 ext cab as a second vehicle. So if I have to do an engine rebuild/replacement it can be done the way I want it. I can build the engine the way I want it to be built and I can take my time with it. In fact I may just rebuild the whole freakin truck if I get this F-150.

TARM · Jun 8, 2011

vanderchevy18 said:
At the dyno shop a 6" long 4" 90 was taped to my 4" exhaust with copious amounts of aluminum tape to route smoke out the door. During 3/4 to almost full throttle that 90 was blown off and hit the wall with enough force to bend the hell out of the end of the pipe.

I'm going with 5".

It does the exact same things with huge stacks. It does not make any dif as you have a 4" dp.