• RED LETTER DAYS #Audi A4 2.0 TFSI 500bhp, big turbo B7 / Words Dan Goodyer / Photography AJ Walker /

    Audi never sold a Misano red DTM A4, so Craig Collingworth built his own – with a top-mounted GT3076r and 500bhp under the bonnet for good measure!

    At first glance you might think this is a factory-built B7 A4 DTM Edition with a set of aftermarket wheels. However, look a little closer behind those 19in BBS alloys... Large Brembo brake calipers from a Porsche Cayenne S hint there’s a bit more going on here than you might expect. If you know your quattro from your Quattro, you might also be aware that Audi never sold the DTM Edition A4 in this stunning shade of Misano Red Pearl. Or you might just have read that fact in the intro. Either way, colour is very important to the owner, 31 year old Craig Collingworth, a man who has sprayed cars for a living.

    Craig bought the car around four years ago. It began life as a 2006 B7 A4 2.0 TFSI quattro Special Edition. Already a very nice car to have as a daily-driver, it had leather trim, lots of toys and a BUL engine with a K03 turbo pushing out around 220bhp. For three years Craig restrained himself from tuning it. He didn’t feel the need, only fitting the BBS wheels after finding them for sale on eBay at a ridiculously low price. Then in early 2014, Craig bolted a hybrid K04 to it, some S3 fuel injectors and a Unicorn Motor Developments remap – and recorded the second-fastest known quarter mile time in the world for a 2.0T A4!

    He explains: “We started going to York Raceway for a bit of a laugh. Rick at Unicorn Motor Developments had re-flashed the ECU to make the engine produce 360bhp and 360lb/ft torque, and added launch-control and flat-shift. The surface at York isn’t great to be honest but we still managed a 13.4s at 101mph, which according to all the info we could find on the AudiSport and Audizine forums, was the second-fastest quarter ever recorded for a non-S 2.0-litre A4. Thing is, that just made me want to go faster.”

    At the time Craig had bought a genuine DTM Edition A4 in need of a new engine. The plan was to source a new engine for it and then sell it. Then he had an idea: “I realised the BUL engine in my A4 was exactly the same as the engine fitted to the DTM, so I swapped it over and sold the DTM complete. They only ever made 250, so I really wanted to keep it on the road. Plus the money from the sale helped me set up my own company and part-funded the next step of the project.”

    Craig had been working for Elite Customs in Leeds. Specifically, he was working for Elite Wheel Repair, using his painting skills to good effect. He then set up his own business on the same premises, CR Motorsport. Specialising in painting and drag racing to begin with, the company quickly grew to carry out engine work, servicing and more. His A4 would become the unofficial company demo car, so it needed a proper engine build.


    To cut a very long story short, a lot of money was invested in a fully-forged S3 CDL engine that went bang. It featured trick parts including a set of pocketed pistons to allow the use of high-lift cams. However, Craig had out sourced the head-work, which included a set of oversized valves. He speculates some of the valves came into contact with each other, sparking a chain of events that wrecked the whole engine and turbo. Not wishing to be burned twice, Craig looked around for an alternative and found a proven engine for sale. It had been built by Rob at TSR Performance and was already making good power.


    Using that engine as the base, the CR Motorsport guys went about doing something a bit different. Craig created the first top-mounted TFSI A4 in the UK by importing an AR Design exhaust manifold from the States. Onto this he placed a Garrett GTX3076r turbo built by Turbo Clinic, Craig adds: “The turbo recommendation came from Paul at Turbo Clinic. He’s been extremely helpful during the build and I highly recommend him. I ordered a 3in AR Design downpipe and had Tony Banks Exhausts in Leeds mate that to a Milltek Sport 3in system, featuring just one silencer box on either side of the rear bumper. On a dark night with the flat-shift switched on, you can see 4-foot flames shooting out the back of it and from the screamer pipe at the rear of the bay!”

    While the car was off the road, Craig had also taken the opportunity to upgrade the suspension and brakes, along with fitting an OEM DTM bodykit that he resprayed himself. He explains: “The ride was very wallowy but I didn’t want to turn it into a stiff racecar, so I went for Eibach Pro Street coilovers and fixed anti-roll bars. The result is perfect in my opinion. The whole car feels like it’s factory-spec when driven normally, then transforms into a much more capable car as soon as you start pushing.”

    He continues: “A lot of thought has gone into the car. I’m always on the Audi forums under the username “CraigCull”. Hours of research have gone into every aspect but with a very specific plan. The whole tuning thing is something I’ve been into for a long time, but I’ve only felt the need to act on it again in the past year or so. These days I’m into cars that look relatively standard – subtle, but with insane performance available, which I’d like to think I’ve created here.”

    He’s not wrong. The mapping is still a work in progress but the car is already very quick, especially for a regular A4. Read the spec for some of the highlights; custom air intake that solves the heat-sink problem, custom breather system, a second set of injectors, water-methanol injection, the list goes on. At the moment it’s running two maps, both written by Rick at Unicorn Motor Developments. One for 25psi boost and around 450bhp, the other a 30psi map for around 500bhp.

    With a bit more boost the engine should make 550-580bhp, that’s Craig’s aim anyway. Then it’s back to the drag strip to see if he can break some more records, and confuse more people with the only red DTM Edition in existence.

    SPECIFICATION #Audi-A4-2.0TFSI-Quattro-Special-Edition-B7 / #Audi-A4 / #Audi / #Audi-A4-B7

    ENGINE: CDL 2.0 TFSI S3 engine rebuilt and forged by #TSR-Performance including 83mm #Wössner pistons, Wossner connecting rods, 1.8T oil pump conversion, #Supertech valves and valve springs, #F-Tech-Motorsport inlet manifold with second set of fuel injectors, RS4 fuel injectors, fuel pressure regulator, in-tank fuel pump and controller. Autotech high pressure fuel pump, #Garrett-GTX3076r turbo with .63 a/r turbine housing and v-band clamp, #AR-Design top-mount manifold and 3in downpipe, #Milltek-Sport 3in exhaust with two rear silencer boxes and 2.5in tailpipes, TiAL Sport MVS external wastegate with screamer pipe, TiAL Sport 50mm recirculating diverter valve, custom front-mounted intercooler with 2.5in hard pipes, AEM Water/ Methanol injection, IE valve cover with vent-to-atmosphere catch can replacing pcv, N205 camshaft adjustment valve delete, N249 pressure control valve delete, inlet manifold runner flap delete, 3in MAF sensor, custom air intake, OEM ECU re-flashed by Rick at Unicorn Motor Developments with 4 switchable maps.

    TRANSMISSION: 6-speed manual gearbox, #APR / Southbend Stage III clutch and single mass flywheel conversion, USP short shifter, launch control and flat-shift.

    BRAKES: 6-pot Porsche Cayenne S 18z #Brembo calipers up front with machined ML55 345x14mm grooved and drilled discs, S4 rear brake conversion including single piston floating calipers and 300mm drilled and grooved discs. Pagid Fast Road pads all round, braided lines.

    SUSPENSION: #Eibach Pro Street coilovers, Eibach front and rear anti-roll Bars.

    WHEELS & TYRES: 8.5x19in BBS CH009 alloy wheels wrapped in 235/35x19 Michelin Pilot Super Sport tyres.

    EXTERIOR: DTM Edition OEM bodykit including carbon fibre rear spoiler, Misano Red Pearl paint.

    INTERIOR: #Audi-A4-Quattro-B7 Special Edition leather trim.

    TUNING CONTACTS/THANKS: Rick at Unicorn Motor Developments, Paul at Turbo Clinic, Dave and Martin at Elite Wheel Repair, Rob TSR.

    Above: quattro helps get the power down.

    Above: Calipers are from a Porsche Cayenne S Bottom: A4 is around 250kg lighter than a B7 RS4 and more powerful!

    Left and below: Craig has equipped his A4 with a genuine DTM Edition bodykit, including the carbon fibre rear spoiler.

    Below: GTX3076r turbo provides ample boost to create a claimed 500bhp.