Question about exhausts...

[DoubleHRanch]

I have an 03 7.3, last of the 7.3's. I am looking at a 4" diamond eye system but wondering should I get the muffler or run straight pipe off the turbo all the way? I would suspect you would need some back pressure to make it run right but I deal mainly with m/c engines so figured I would ask the experts. Thx for the help.

[Justin@DP-Tuner]

Either way is fine. If you want loud, then get the straight pipe.

On turbocharged engines, the less back pressure, the better.

[Im_Strokin_ur_Cummins]

If you cut the muffler out of your stock pipe you will get the same effect a 4in does. 4in flows slightly more then the stock pipe but does sound nicer. With these engines no back pressure is needed, the more air you flow with a diesel the more effecint it is

[zrain25]

I got a 4 inch diamond eye with muffler. Great exhaust


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[hooperduty]

hey guys i realize this is an old post but im in the market for new exhaust, im looking at getting turbo back for sure but on the fence for whether 4" or 5" would be better, its mostly a daily driver for me but i do tow my boat in the summer. i plan on putting more mods in the future to make it a great all around daily driver/tow rig/good fuel economy.

any recommendations for brands and what size pipe would be better is appreciated. im thinking of going with a straight pipe 5" just to get better flow.

[Im_Strokin_ur_Cummins]

Originally Posted by hooperduty

hey guys i realize this is an old post but im in the market for new exhaust, im looking at getting turbo back for sure but on the fence for whether 4" or 5" would be better, its mostly a daily driver for me but i do tow my boat in the summer. i plan on putting more mods in the future to make it a great all around daily driver/tow rig/good fuel economy.

any recommendations for brands and what size pipe would be better is appreciated. im thinking of going with a straight pipe 5" just to get better flow.

Unless you are gonna be pushing high HP there is no need for the 5in it just has a deeper sound no actual gain over 4in on a DD set up. Though it does sound awsome when driving

[Critters diseals]

I have a straight pipe on my 7.3 with an Aem intake and it sounds great...

[hooperduty]

I plan on upgrading its mods in the future with a chip and tuner...etc, I will eventually replace it with another DD so more HP is definately in its future since it will become just now tow rig and somewhat of a toy. I don't want my exhaust to be obnoxiously loud which is causing me to think the deeper 5" will sound better too.

[Justin@DP-Tuner]

Originally Posted by hooperduty

I plan on upgrading its mods in the future with a chip and tuner...etc, I will eventually replace it with another DD so more HP is definately in its future since it will become just now tow rig and somewhat of a toy. I don't want my exhaust to be obnoxiously loud which is causing me to think the deeper 5" will sound better too.

Your truck will be obnoxiously loud with a 5" exhaust. There really is no benefit to the 5" system other than sound(if you would even call that a benefit).

[Young-SC-Owner]

Honestly, not worth the cost.....secondly the kits come with a 4" down pipe to 5" back, it will only flow as good as the biggest pipe....not worth the extra 80. Bucks or so for the 5" dp back


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