right size exhaust

[twitchcvma]

got the Diamond Eye 3" down pipe, gutted the cat. Looking to upgrade my exhaust. Heard somewhere that anything over 4" cat back was useless. Plan on upgrading injectors at some point. Currently running Super Chips programmer. Should I stick with a 4" exhaust? is 5" exhaust really too much? Thanks

[Jacob@DP-Tuner]

The 4" systems are more than enough to support most trucks. There is no real performance gain with a 5" system, just a deeper throatier sound. In the end, it's really up to you and your personal preference.

Let us know if we can help

[kramarj]

I vote for 5", I have it and love the sound. Only downfalls of it is it is tight and have quite a bit of turbo whistle, but other than that it is awsome. 4" is fine to I just like the sound of 5".

[bucwheat]

3" DP and 4" exhaust here. no need for 5"

[Silver200273L]

4 inch DP and 5 inch straight. Love it!

[Silver200273L]

I think 5 inch will lower exhaust temperature better than 4 inch but I'm not sure.