3.5" vs 4" exhaust

[JimboJames]

I have found inexpensive was to straight pipe my stock exhaust. I am gonna see a big difference with that vs a 4" system?

[szyd]

You should be fine with the 3.5". Most say the big restriction is the cat and muff.

[Matt P]

Yeah straightpiping the stock is definitely the cheapest route, you wont see a real difference if you go with a 4", the mendrel bends and everything are just nicer

[JimboJames]

Cool we're talking $100 vs $250 for a 4" kit. I need to be cost effective with the way things are going.

[Matt P]

Id say just go with straightpiping the stock exhaust for now then

[TxOutlaw]

This is the route I am going unless tuning my rig will require 4" system to lower egts!!

[AFBLUE]

Originally Posted by Matt P

Yeah straightpiping the stock is definitely the cheapest route, you wont see a real difference if you go with a 4", the mendrel bends and everything are just nicer

6.0 are mandrel bent anyways. 3.5 would be just fine for a mild stock mod. The EGTs wont get crazy and would only be a small difference in hp between 3.5 and 4"

What is 100? the muffler delete pipe is $65.00
03-06 Ford 6L Powerstroke Diesel Stock Muffler Delete Pipe

[TxOutlaw]

Oh snap! It doesnt have to be welded?? If thats the case I can do it myself!!

Also, I am getting 150.00 shipped for the muffler and cat delete from that site?? Any cheaper sites to look at?

[AFBLUE]

Originally Posted by TxOutlaw

Oh snap! It doesnt have to be welded?? If thats the case I can do it myself!!

Also, I am getting 150.00 shipped for the muffler and cat delete from that site?? Any cheaper sites to look at?

Yeah you just have to cut out the stock muffler because thats welded in, then just muffler clamp it in.

The cat is a direct bolt in piece, no cutting. But personally I would just punch out the cat if you are never going to use it again.

[TxOutlaw]

So just gut it and keep the cat housing in place?