Question 4 Inch downpipe

[DA-HEAT]

I am looking to get ideas on the best exhaust system for a 6.0(Trying to achieve about 800 rear wheel ftlbs. of torque). The largest downpipe I have seen is a 4" and was wondering who all makes them the only company I have found is Heartthrob Exhaust(found it on ebay). What are the gains anyone has seen with this downpipe and would it be best to install a 5" straight pipe exhaust or would a muffler be needed for a little backpressure with the 4" downpipe.

 

[Dogman]

I'm looking for just the 4" down pipe. I'm going to run duals, I just did it to one truck and kick it out at the running boards. It's sweet sounding. You can see some of the work on the thread Night job.

 

[atk]

I am looking to get ideas on the best exhaust system for a 6.0(Trying to achieve about 800 rear wheel ftlbs. of torque). The largest downpipe I have seen is a 4" and was wondering who all makes them the only company I have found is Heartthrob Exhaust(found it on ebay). What are the gains anyone has seen with this downpipe and would it be best to install a 5" straight pipe exhaust or would a muffler be needed for a little backpressure with the 4" downpipe.

MBRP makes them also. even if you go to a 5" exhaust, you will still have a 4" downpipe(i haven`t seen anybody offer a bigger downpipe then 4"). i think for the power output you are going with, a 4" turbo back exhaust will do. going to a 5" will just make it louder....

as for the Heartthrob exhaust, have herd the name, but that is about it. not sure how good the quality or fit and finish are....

 

[sawed off]

I'd stick with the mbrp I guess if I was u. Thats what a lot of people are using on these 6.0's. Heart throb is a well name knowen for gas cars and trucks if I remember right.

 

[DA-HEAT]

Well I started out looking at the mbrp s6224al system which is a turboback 5" off road system, but with all the info I have found it seems that kit only has a 3.5" downpipe. But I just did a search and found they have a 4" downpipe gp003, I just don't understand if they have a 4" dp why they wouldn't include it in the 5" system But maybe I can get buy with just the 3.5" downpipe I just don't want it restricted more than it has to be but w/ the power levels I hope to achieve I guess it might not need the bigger downpipe.

 

[no-red 6 0]

'the word on the street is' that there is no difference in performance between the 3.5/4" dp.... i have read that many times in exhaust comparisons... some say it is a 'clearance' issue as to why they use a 3.5" but i also know a 4" fits cuz i helped a buddy put a flowmaster system on a truck..

it is a personal preference

btw: some firewall pounding/porta-power was necessary to put this flowmaster piece on and to not use the fireproofing tin foil either....and heartthrob is here in MN down the road a couple hours....

iirc: some of the exhaust makers DO have a 4" dp but you need to ask for it!!!

 

[DA-HEAT]

Thanks Red I guess that was really my question; How much performance gain? I thought there might be a difference between the 3.5-4" dp but assumed if there was it would be minimal, just kinda wanted other guys opinions

 

[dennisj2003]

I talked to MBRP and their 4" down pipe is only 3.5 they advertise it 4" but it is wrong. The only differance is it is a mandral bent tube for better flow.

 

[DA-HEAT]

Is that right? I thought the one that came with the turboback kit was mandrel bent and 3.5". But I saw they did offer what the website called a 4" dp guess there is a lot of fancy wording and loopholes.

 

[no-red 6 0]

I talked to MBRP and their 4" down pipe is only 3.5 they advertise it 4" but it is wrong. The only differance is it is a mandral bent tube for better flow.

REALLY?!

nice, thought they were one of the only ones who had a 4"...

anyway, thanks for the update

and your welcome heat