Outer Limits 4x4 Board

I am in the process of rebuilding my 4wd. I am running an LS3 that i've stroked out to 7ltrs, with a dual 3'' exhaust. Any recommendations for mufflers to give a nice but aggressive note? thanks for the feedback

my recommendation is the biggest fattest (quietest) muffler you can get.

Loud exhausts contribute to fatigue, draw unwanted attention from people in uniforms, and generally just deafen you from hearing things over the radio/from your spotter/from your passenger =)

just my 2c.

Mate if you have worked the engine! Hi flow mufflers are what you want! What size exhaust are you running? Twin or single?

he said 3" twin

Seriously, what on earth does "Hi Flow" mean? It's not a measurement - it's just marketing nonsense.

If you already have a twin 3" system your biggest problem is going to be fitting enough muffler under the car to keep it quiet.

No atmo 3.5litre motor running even 250HP ever needed a single 3" exhaust - your 500hp 7 litre doesn't need twin 3". That pipe diameter is going to equal a LOT of noise.

Take it to a decent exhaust shop and get their opinion. Fitment is gong to be the issue, not the style or brand of muffler.

PS I've built some really loud cars and they suck. Quiet is the new loud.

Steve.

We went from 286 to 315 rwKW in a 6.0L LQ9 supercharged in going from a single 3" inch to a twin 3". Particularly if you need to to run reverse flow mufflers, cats and so on.

Joel

I wasn't claiming that a single 3" was enough flow for that motor in total, only that a single 3" system might be "plenty" for 1/2 of a 7.0 LS motor nad is going to be hard to keep quiet when you are dealing with the ground clearance issues under a 4WD.

Steve.

craz3d wrote:he said 3" twin

Like he said Mouse

Gwagensteve wrote:Seriously, what on earth does "Hi Flow" mean? It's not a measurement - it's just marketing nonsense.
Steve.

Exactly why he should forget the hi flow and go straight for a stage 3 set up. Everyone knows stage 3 is the bomb for performance engine components.

While we're on the choice of mufflers what's the go with those mufflers with the electronic valve in them that make them go from quiet to loud with a press of a button? Reckon they'd fall apart or the valve system bugger up on the corrugations?

thanks for the feedback guys. i was lucky enough to put a 3'' body lift onto the car so we'll run the exhaust between the chassis and the body to help protect it. i know there is nothing worse than when all you can hear is a loud exhaust at the end of the weekend when you are heading home tired ... that being said when i put my foot down it would be good to hear it roar. will look into all suggestions. cheers.