headers and exhaust for non turbo 4.2 diesel patrol

I would be interested to hear from anybody who has fitted headers and exhaust systems to their 4.2 ltr GU non turbo patrol. I would like to know what headers and exhaust systems used and if there is any noticeable difference to power and economy.....
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Reply By: Wayne's 60 - Thursday, May 29, 2008 at 22:22

Thursday, May 29, 2008 at 22:22
G'day Billy,

Sorry to say that I can't give you an answer to your enquiry, I'm answering to let you know that someone has at least read your post. I also have trouble with the amount of past, current and "my mate has one" Nissan owners not making any comment!!

I had extractors and larger pipe fitted to my 60, not run up on the dyno before fitting, so it's hard to tell what the improvement was. With the 80, I've been told that the Beaudesert (Spelling??) system will work well as an interum fix............ next is to fit a hair dryer!!
Possibly ask your question on the Patrol forum, to get an informed answer?

Hope this helps a little.


AnswerID: 306633

Follow Up By: billytwo - Friday, May 30, 2008 at 08:14

Friday, May 30, 2008 at 08:14
Thanks Wayne, trying not to fit a hairdryer even though its the best way to go, have been told that there are some good systems out there, one being the Redback headers with a 3 inch mandrel bent pipe. Thanks for yor reply..
FollowupID: 572615

Reply By: Member - morry H (WA) - Thursday, May 29, 2008 at 22:38

Thursday, May 29, 2008 at 22:38
hi billytwo
been down that path wasted time and money.this how i did it the end result is very good
(1) fitted extractors and 65mm ex result not good then removed
(2)fitted gas to the engine very good but still needed more
(3)fitted a denco turbo system cost 2.900 i fitted it myself and thats the way you should go if money permits good hp with the gas assist and a pleasure to drive now works for me so do your home work by the way i have a import 1987 safari shorty 120.00 ks on the clock regards morry

AnswerID: 306642

Follow Up By: billytwo - Friday, May 30, 2008 at 08:18

Friday, May 30, 2008 at 08:18
Have a brother who went with the gas system and not very happy, presently building a house so funds are an issue so I will proberly go down the headers path until the funds are available, thanks for your reply....cheers
FollowupID: 572616

Reply By: Brian - Friday, May 30, 2008 at 08:19

Friday, May 30, 2008 at 08:19
Hi billytwo,
My GQ was a naturally aspirated 4.2L that went OK.... I did try a larger exhaust but although it had a louder note, it didn't go any harder. Then we bought a camper trailer and slowed down even more! Fitted a turbo, in our case a Turbo-Glide system from Russellvale in NSW, and haven't looked back.... except to see who it was we overtook!
It's an expensive thing.... if you can do the work yourself it can save you maoney, our was $2900 for the kit, and I spent another $2000 on fitting it, getting my injectors and pump overhauled, tuning the fuel system, and fitting a booster gauge and a pyrometer. I wouldn't have a turboed engine without the pyro.... it's cheap insurance to know whats going on under the bonnet!

Let us know what you end up with.


Brian (Gold Coast)
AnswerID: 306690

Follow Up By: billytwo - Friday, May 30, 2008 at 08:37

Friday, May 30, 2008 at 08:37
Hi Brian, I agree turbo's the way to go have owned several over the years in fact have owned 13 4wds over the past 33 years. The last turbo I had fitted was on a 95 2.8 ltr Forerunner by Tony Motson (Motsons Turbos) at Beaudesert Brisbane, I cannot speak highly enough of that Safari system and the service provided by Motsons. I will proberly go with headers and 3inch mandrel system until the funds are available for a turbo...cheers Ernie
FollowupID: 572621

Reply By: kiwicol - Friday, May 30, 2008 at 10:29

Friday, May 30, 2008 at 10:29
Hi, have a GQ 4.2 diesel tried the headers and 2.5 exhaust and did very little picked up a bit on fuel economy. Then fitted a super charger, which is way out of your price range. I was able to keep the headers and the low down tourge from idle is spot on, something a turbo is unable to supply. Its been on fo 200,000ks with no problems at all. A turbo and bigger exhaust is the only way to get what you want for minimum dollars. Col
AnswerID: 306724

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