I fitted one to 3 consecutive Commodore utes that travelled 1000000 km between them. Absolutely no difference in fual consumption on any of them. All fitted with dual fuel set ups and every drop of fuel used tracked for tax purposes.

I put one on a mazda bravo 92 4x4 2.6litre petrol. instantly got much better acceleration, and got extra 30-40kms per tank. Iam getting one fitted to my 2.4ltr hilux diesel and cant wait to feel the improvement as they are supposed to be more effective with diesels. But seriously if your car is in good nick, dont drive like a fool - i cant see why you should have a negative effect with this product. I recommend the Hiclone

I've had Hiclones in the last 5 vehicles, carby, Efi and Tdi all with excellent results, if a company is giving you a money back guarantee based on your happiness with the results and has been around for over 20 years it's obviously on to a good thing. I would recommend Hiclone to any one who needs more power and economy to give them a go.

I put a hiclone in a 1986 landcruiser 12HT turbo diesel about 14 yrs ago it made the turbo cut in 300 rpm earlier so less throttle needed to accelerated resulted in an 0.5 lph fuel saving. It also reduced the vehicle from labouring at low rpm by 150 rpm I was happy with the results.

I have used hiclones on three vehicles now. I recently fitted one before the AFM in my r33 turbo skyline and was impressed with the instant result. I believe just as an intercooler does the heat from air being sucked in dissapates into the stainless fins on the hiclone hitting the AFM cooler and denser.

I tried two Hiclones in my 4x4 TD. First off, a lot more intake noise was noticed. Yeah cool. I am guessing due to the RESTRICTION in the intake hose is why more noise was heard. Further more, no improvement in performance and bugger all improvement on fuel economy.

My advice, buy a potato, cut it in half and jam one of the halves in the intake.

Placebos must be a wonderful thing if you believe all the hype/

I have kept a full log on my Toyota LandCruiser 105 Series HZJ105R Diesel 2001 model of each & every fill, Kms/Litre, Litres/100kms since new. HiClone in QLD recommended I also fit the recommended two HiClones as well as a Snorkel & Reusable Air Filter. Realistically the overall performance was noticed especially when towing. However the fuel economy was approximately 10-15% better. The figures do not total what we should have saved overall as if you do the math we should have seen a 20-30% decrease in fuel usage. I do not think I would install the HiClones now as I would need four of them in the 200 Series Diesel LandCruiser at a cost of $800. I would recommend the Air Filter as well as a Snorkel with large bore & air ram.

I purchased 3 hiclones and a K & N filter, Getting tired of the rangers very ordinary fuel economy. Was promised a 20% gain in fuel economy. First tank gave me a 10% gain, since then every tank has been getting slightly better. Must be the computer, adjusting. Was a skeptic before purchasing, was an easier decision considering it came with a money back guarantee. Still far from the 20% promised but it's showing signs of getting there
Saving fuel (diesel), saving 10%+, more power, nicer to drive
hoping on 20% saving, might still get there. Not cheap, spent $600+

Fitted two hiclones to my 2005 rodeo diesel they made no differance at all a total waste of over three hundred dollars.i think I got ripped off.would nod recomend them to any of my friends.really really diserpointed in the product.Would have been money better spent elsewhere.will not buy them ever again....

Waste of money

From the moment a Hiclone was fitted to my 2009 Subaru Forester petrol consumption has steadily increased over the past two months with no increase in power or anything else beneficial. Despite the vehicle being fully and properly serviced during the period fuel consumption is up by over 15%. Buy one at your peril.

Expensive, their warranty runs out before their recommended run in period and it actually wasted more fuel

I have had one installed for over 5 years, they definitely make a difference but a lot is in your driving technique. Firstly the seem to make more power and torque so if you are a lead foot nothing will help, you'll just accelerate faster. However because they provide more torque lower in the rev range the car becomes more driveable and the technique I evolved was to drive 1 gear higher everywhere. My car will cruise down the road in 5th at 60 km/h @ 1400 rpm and pull away cleanly in 5th from as low as 45 km/h. Giving me 10L/100 around town. Another bonus is spark plugs last a lot longer, mine have done 130,000 km (100,000 km normally).
More bottom end power, increased driveability and better fuel consuption.