"Top Boss Performance are clearly the best source of knowledge and preparation of the Ford Cosworth V6 engine in the UK"
Norman Snowdon, Ginetta Owner
"Just to say a big thanks to Fitz and the boys at Top Boss as I am well pleased with the latest engine upgrade to my car. Not only did they upgrade the engine but completely renovated the engine bay. This is the third upgrade they have done to the car over many years. Firstly converted it from a standard Sierra XR4x4 with 12v Cologne engine to Group 1 Fast Road 24v Cosworth engine, then a few years later converted to small turbo, low boost, twin turbo 24v Cosworth engine. Now finally, I have decided on the new twin turbo STORM 24v Cosworth engine. Really looking forward to better weather to get out in it."
Martin Sierra 4x4 Owner
"Well Mr P, I am very impressed with that piece of engineering on the prop, it drove home superbly, to cut and shut that prop like that and have it run as true as dose is nothing short of brilliant. We drove it at 90mph nearly all the way home and it did not miss a beat, cheers mate brilliant job."
Vic from Aylesbury Granada Ghia 2.9
Thank you very much for the new Chain Guide Tensioner.
I repair the car last weekend. The new one fit perfect.
The tensioner you send to me is the facelift version.
The old one from my car start leak oil because at the old version the oil go around the mounting bolt
while flooding from the left to the right side. The new tensioner is completely different and the oil in the new version did not go around the mounting bolt so it never start leak again. :-)
Christian Kern in Germany
Top Boss are excellent. There's seems to be nothing they don't know about the Cosworth BOA engine and the cars it goes in. Whenever they have worked on my car it goes better than ever, and I never have cause to revisit anything they do. They recently supplied a new Cosworth BOA for my 26yr old Granada, and carried out some other minor works. It's always worth the nearly four hour drive each way. I have been wearing a near constant smile for the last nine weeks since I got my car back and I am enjoying driving again!
Booked my classic Alfa in at Top Boss for a rolling road session after unsuccessful results elsewhere. First run provided 94 bhp as a benchmark. After many runs and a lot of tweaking 105 bhp was found. Very happy with the results. A much better and smoother drive and more power. Booked it in for a custom exhaust build to release a few more bhp. Fitz and the lads are sound and very knowledgeable in what they do. Very happy customer.