Earlier than Audi launched the A3, and lengthy earlier than the A3 turned a sedan, the Audi A4 was the German model’s smallest sedan variant. Within the late ’90s when the moniker was first assigned, it was the B5 era that wore the badge with pleasure and endeared itself to followers, significantly in S4 and later RS4 guise when it was propelled by a 2.7-liter twin-turbo V6. However even that is not sufficient for some, and one proficient mad mechanic has seen match to take an A4 and S4 and equip them with a twin-turbo V8 and naturally-aspirated V10, respectively.

Featured by YouTube channel Deutsche Auto Elements, these builds are primarily based on a 1997 Audi A4 and a 2000 Audi S4. The A4 acquired a V8 swap, whereas the S4 received the V10. Judging from the quick clips of the vehicles working, they’re a hoot to drive.

The 4.0-liter V8 engine within the A4 got here from an Audi S7, though the proprietor, Martin Harp, says he bought the engine standalone off of eBay. It retains its inventory five-speed guide gearbox and quattro all-wheel-drive system. It additionally makes use of a beefy-sounding aftermarket exhaust system.

Martin says he solely realized about Audis when constructing the bonkers 5.2-liter V10 S4. He is had that automotive the longer of the 2 builds. Just like the V8, he purchased the V10 from eBay and put in it in his storage. Thankfully, the engine was sourced from an Audi, however not the Audi you would possibly assume. It did not come from the mid-engined R8 however somewhat a D3-gen Audi S8.

As anticipated with becoming a bigger engine in a smaller automotive, there have been some difficulties. Martin says he needed to hammer down the automotive’s firewall for the engine to cram inside its engine bay. The engine can also be pushed again so far as potential, so the angle on the entrance axle is so “loopy” that its CV joints popped out at one level.

To treatment that, he ditched AWD and caught to rear-wheel drive. However after the enjoyable wore off, he received AWD again when he put in oily bits from an Audi A4 allroad. The V10 Audi sedan additionally makes use of an aftermarket subframe, and the battery has been relocated to the rear. It’s also extraordinarily loud because it makes use of a straight-pipe exhaust.

Each vehicles speed up brutally, too. In a nutshell, they’re an Audi fan’s dream come true.

However the builds weren’t simple, and even for a seasoned mechanic like Martin, they required lots of of hours of analysis alone, studying via Audi workshop manuals to grasp how these bits and items would match collectively like some Frankenstein’s Monster.