WH 5.7lt Exhaust questions
 

hey there fellow Grand owners

just picked up my 2006 WH limited 5.7lt and just wondering does anyone one have any opinions/options in regards to full exhaust upgrades or cat back upgrades, im in the country and unfortunatly dont have a good exhaust place i would trust with my Grand, if it was my old HQ no probs lol

any help would be great

Howdy Tygerr79,

I went down the same path as you looking for a system that would produce a nice burble with no drone at highway speeds. The Dealership wanted to fit the Mopar 300C sports system which is a manifold back replacement - cost is around the $3,500 mark plus fitting.

When I put the acid on them they admitted it would drone and that performance and fuel economy would improve only if I also had the Mopar cold air intake fitted at a cost of around $1,800 plus fitting. A bit pricy for no guaranteed benefits - specially when they admitted that they had not previously fitted this kit to a WH Hemi.

Didn't want to be the test case so I discussed muffler mods with my local Ozfit (who has been in the exhaust & brake trade for 42 years) and has changed a few previous Jeep systems for me. He recommended removing the 4 foot main muffler & replacing with a 30 inch long, 7 inch diameter round truck type muffler and retaining the rear resonator. He advised me that the stock cats are high flow, so only wasting money changing them & the rest of the system is free flowing 3 inch - all the congestion is in the main muffler (which makes it sound like a 4 cylinder).

This simple mod which cost $280 has given my 2007 Hemi Limited an exhaust note to kill for and in the process lowered my around town fuel consumption by a little over 2 litre per 100ks. I know the brand is Lukey, I'll ask Les what the model number is and post in a follow up.

The Dealership has commented about how great it sounds. Makes me wonder about all the Mopar mods they wanted to sell me because they have also admit that a 300C Demo with it fitted droned to the point where the sound system could not drown it out.

I have also been looking at this for a while my local performance workshop quoted around the $2000 mark for a 3" cat back system made to fit. Or ordering a system from the US but the freight is a killer for an item that size. So oldgringo's option looks good as there is a carline that fits Lukey local here. I know that Lukey also does high flow resonators so that might be an option for later. Oldgringo if you cant get the part number could you get a picture and some dimensions co I can try to match it up localy.

Freight goes on both weight and dimensions.
Never order a system (or anything for that matter) from USA and ship by UPS or FEDEX, use United States Postal Service (USPS) whereever you can- its up to half, sometimes 1/3rd the costs.

I had some headers for the 360 shipped from us, together with the USPS freight it still came in at around 60% the cost quoted to have a system made here. AND came with all bolts flanges, gaskets etc, and was an easy bolt up fit.

No doubt you could find a similar set up for a grand in the US.

I could understand ordering headers from the US but pipes and mufflers ?? You could source them here surely, though some of these "Specialist Places" charge like a wounded bull when the local BP workshop has the same item at less than half.

irvs351.

Just got under the GC with verniers & a tape measure; the muffler is a Lukey Sports performance, 24 inches long, 6 inch diameter, 3 inch pipes. Every sticker is still on it except the small one with the part number. Lukey mufflers are now marketed through Walker - already knew that, but the sticker confirms.

At the time I asked about changing the stock resonator - he said "don't, the stock is a good one, change or remove it and the exhaust will crackle & pop". There was a reason - something to do with the body design and acoustics.

I catch up with Les (Ozfit) at least weekly, so I'll get the part number from him Monday.

oldgringo,

Thanks for the information if you can't get the part number those dimensions should do.