Mufflers 4.2 diesel

[89GQ]

I was actually after a bit of volume and performance [ not crazy loud just to be able to hear it would be nice] i went down the local mffler shop which the guy said he had a patrol as well and he was quite happy with just replacing the front muffler with a Sports muffler with the standard system he noticed a gain in volume and also a little more go , but what he thought was even better was that he got an extra 50km a tank . I was just wondering if any one else had done the same and what the results were ? Cheers guys have a good week end .

I would be interested in what type he used?? are sports mufflers the same just different size pipe?Cheers.Let us know what you get!!

[country boy]

Hi 89gq i'm not shore wot brand sports muffler he used , the standard muffler has 3 sections in it before it comes out the other end but a sports muffler has a pip straight through from front to back but the pip has holes or perforations in it to dull the noise thats wot the guy said anyway .

[89GQ]

Hi 89gq i'm not shore wot brand sports muffler he used , the standard muffler has 3 sections in it before it comes out the other end but a sports muffler has a pip straight through from front to back but the pip has holes or perforations in it to dull the noise thats wot the guy said anyway .

Cheers! I might go to a few shops and sus it out!

[Roo72]

My old's have a 92 GQ td42, They fitted extractors and a 2.5" aluminised mild steel sports system(only one offset glass packed muffler) while they were midway around Oz on tour(Darwin). they had skirted the Kimberly towing a 22ft van and found the going tough, could only travel in the early morning then make camp by 10am as the truck would get slower and slower and the cloud of black smoke thicker as the day got hotter. Dad said the difference was huge, better economy, less smoke, more poke, tow all day if you like. Its not too noisy and the system is still on it now some 15 years later. Sound kinda horn....for a NA diesel.

Cheers Roo.

[country boy]

Hi guys well i got me a sports muffler on today , a little disappointed in the lack of noise but rather happy with it being more free revving . So when i can get some extra funds i think i will put a 2 1/2 inch straight pipe from the rear joiner back . cheers

[red92gq]

While your at it check out the flex joint in the rear section of your engine pipe .
Most of the flex joints are reduced to about 1,1/2" at both ends .
Getting rid of this restriction by fitting a bigger flex joint helps too.

[country boy]

Okay red92gq will do , thanks for the heads up . am i able to tell from the out side or how do i find out if it is 1 1/2 inch internal ? Cheers and thanks for any info every one , much appreciated .

[country boy]

Hi Red i took of the cover that is over the front end of the flex joint your not kidding it must be about 35 mm and the rear of it is about 40 mm . It just makes me wonder why the hell or wot the hell were they thinking of when they built them like this . It actually reminds me of a Yamaha DT200 dirt bike i had it had a washer welded to the inside of the expansion chamber just where the gases come in from the head , take it out and it turns it in to a different bike . So this will be my next thing to do just need to get some money to do it .

[country boy]

Well guys i had the flex joint and restrictions on either side cut out a replaced , and it sure did make a difference . So now my question is how can i make it louder ? Any body got any ideas ?
Ps just dont want it crazy loud that the cops are going to be interested . cheers guys .

[Woof]

Go 3" straight through