"Rover 75 improved performance."

I bought the kit as the air flow sensor had failed on my 2006 registered Rover 75 Tourer.
I should have considered it sooner as it certainly has given the car improved power and driveability.
It is easy to fit and I consider it to be a worthwhile purchase.

"Excellent product that does exactly as…"

Excellent product that does exactly as advertised.. Getting much more power an torque as well as improved fuel economy. Really quick delivery as well..

"Great little gadget easy to fit and…"

Great little gadget easy to fit and made my VRS fly !!

"This company can be trusted to buy from…"

This company can be trusted to buy from I’ve had some great results.

"Superb products that really do work"

Superb products that really do work, excellent after sales support.
If I need to tune a vehicle they'll be the first company I contact!

"Well what can I say I'm over the moon…"

Well what can I say I'm over the moon Iv a mg zt cdti with a 160 map with a maf delete with other mods I wanted more power so brought a synergy 1 from rover Ron what a difference the car went well beforehand but with the Ron box on its a absolute animal Iv got the bug and I want more, the box is amazing postage was very quick (1 day within ordering) well made and quality comes with all instructions the after care/advise is one of the best Ron comes across as a sound bloke and gives really good advice even if like me your asking alot of questions on how to go further advise anyone who is on the fence about a Ron box then grab one especially with a 160 map makes a big heavy mg zt barge go like a small nippy
hatchback,
If your reading this Ron then thanks for pushing the boundaries my friend absolutely amazing bit of kit for very little money

"Had a Synergy/Ronbox for over 4 years…"

Had a Synergy/Ronbox for over 4 years and they have just re-cabled it for my new car.....superb product and service, Thanks

"Range rover p38 diesel re born"

Ive had many range rover p38 diesel over the years and every one ive paid £200+ for a re-map but got to say this synergy 4 ronbox is in a league of its own without a doubt worth every penny my 2001 range rover p38 diesel was doing 20mpg as stated in the manual and top speed of around 90-95mph soon as I fitted the ronbox was advised to keep it on number 2 for now and wow what an amazing piece of equipment mpg has shot up to 30-32mpg on the motorway and 27-28mpg round town top speed so far is 115-118mph and the performance is incredible
Dont waste money on expensive remapping these guys know what there talking about and there synergy 4 ronbox is the business thanks guys will deffo recommend to others

"very helpful good products and prices"

very helpful good products and prices

"Excellent"

Excellent, recommend tuning-diesels to anyone.