4" or 5" DP back exhaust???

[F250Marine]

I'm a new guy to the diesel world. I'm looking for opinions on either a 4" or 5" DP back exhaust straight piped. I'm looking for the best sound and performance.
So far I have an s&b cai and have decided to go with spartan for tuning. The packages I have chosen from Rudy's is only about $60 difference between the 4 and 5.
Any input for this FnG would be greatly appreciated

Semper Fi,
Zack

[travisH3]

Go 5". It will give you better sound. No performance difference. Just looks and little deeper exhaust tone.

[F250Marine]

Thanks, that's what I was originally thinking but it's hard to tell on you tube videos

[DSTRBD]

4" is all you really need, but 5" looks and sounds better in my opinion.

Let us know if we can help with anything.

[bigt2317]

5" does sound better although it has 0% better performance. Not sure if you ever wanted to put air bags on your truck or have a in bed hitch but I just had to modify my 5" after installing my airbags. Also, I did have to bend a few hangers a little to make the 5" fit without banging or rubbing.

[08stroker250]

5" fits perfectly on my truck....and on most trucks.

I say go 5".

[Eric@PTP]

Owning the same truck and also working on them I say 5" all the way, no muffler ( not needed for the stock turbo trucks ). Has a nice aggressive sound but isn't loud.

[F250Marine]

5" it is! I do have a b&w goose neck, but I looked and measured today and looks like everything shoud fit great. Can't wait to get this on my truck. Thanks for all the info

[cbenn]

I have air bags and a 5th wheel hitch installed, run 5" with no clearence issues anywhere.

[F250Marine]

Thanks guys for all the info! I just placed my order for the spartan tuner and 5" cat/ dpf delete straight pipe! Should be here sometime next week, can't fricken wait!!