That is mine! I have since added a new CAI, and some port work. You know that did not cross my mind. I just talked to Kelly the other day about head work.

 

True-duals won't gain you anything, if anything it'll cost you.

Change out the Flowmaster with something more free-flowing. Seriously, it isn't helping anything. jmho of course.

To get to the 400HP mark, you're going to need more compression, more fuel and better heads if you're not boosting it.

 

Which CAI did you go with? 4"? That is a strong 4.8

 

I actually had to fab my own, as my truck is tubbed and I moved the battery up to the stock air box location. I upgraded to the ls7 TB, and built one over to the Dr side fender, built a box, to grab air from over their. And yes it is a 4".
I am thinking now of going back to the magnaflow single muffler. Thanks guys

 

Got any pics of the intake setup? Would be interested to hear your dyno numbers if you go back again.

I have 1 3/4" long tubes with off road Y pipe into 3" cat back with a huge Magnaflow muff and a dynomax bullet right before a turndown at the roll pan. I'll get a video of what it sounds like.

 

Sure I would love to hear it

 

Sent ya a PM

 

I would steer away from true duals. You aren't going to gain from that type of setup like you would on an older vehicle. My recommendation, if you want it quieter, especially inside of the truck, like the look of duals, and still want some bark when you step on it would be to go with a 3" single in/ 2.50" dual out Flowmaster Super 50 Series muffler.

 

Not sure if you have a st cab or ext cab truck but I bought the magnaflow kit part number 15840 witch is made for ext cab 6.0 trucks and it sounds great. It's true dual 2.5" with resonators and a x pipe built into a single muffler. I had my cats removed and had a pipe made for the drivers side to cross over to the passenger side. I have long tubes as we'll. it's kinda expensive but it's all stainless steel. Think it's $778 on summit right now. Just an option for ya.

 

I'm currently in the middle of a true dual setup

Right off the collectors I'm running dynamo 9in race bullets into an x-pipe and you wouldn't believe how much just that quiets the truck down.

After the x-pipe and dumps I'm going into 2 Hooker all flow mufflers and I'm hoping its going to be drone free and extremely quiet at cruising speeds. Ive heard these mufflers on a GTO and they are just about stock cruising but start to get loud when you get into the pedal.

Check out my build and i'll make sure to post up my results to help you decide

https://www.performancetrucks.net/fo...xhaust-533150/