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Right, where to start with this... Having now reached a dizzying 1000 miles in my new Lupo I'm getting to grips with it's niggles and minor faults, but there's one persistent issue that really irks me... When accelerating hard in 4th and 5th gear (Around 3K RPM or above and between 40-70mph) I tend to get a heavy pulsing/judder/vibration feeling through both the steering wheel and the pedals. Most of the time this isn't an issue as I poodle the car round at sub 2k engine speeds, but it's something I'd like to get to the bottom of none the less! So far I've had all four wheels balanced and also had the car's alignment set up with a hunter 4-wheel alignment machine. This was actually carried out by the chaps who work on my Mazda (As a bit of a favour because we're friends ) they're a sportscar specialist and I have the printouts and saw the wheel balancing happening so I know this was done properly! You guessed it, no improvement At this stage my thoughts have turned to engine/gearbox mounts or possibly a flywheel issue *Crosses fingers for not flywheel* My question is simple... 1. Does anyone have any thoughts/musings/advice as to where I should be looking and as to what this issue might be? 2. Is my car (SDI) fitted with a dual mass flywheel? I'm assuming the answer to this is yes on the basis there seem to be several 'Single Mass' conversion kits available online, like this...https://www.dmrclutch.co.uk/products/dmr6008-dual-mass-replacement-flywheel-clutch-kit-75.html and another...http://www.eurocarparts.com/solid-flywheel-conversion-kit It's also worth mentioning that despite finding multiple 'Solid Conversion' kits online if there is an original style 'Dual Mass' available I can't find it so I'm assuming this is a part I'd need to go to VW for? Thanks in advance for any help or advice chaps. FWIW the car's so old/cheap that I may well not bother chasing this down but my inner meddler means that I can't stop trying to think of ways to get round or explain this issue.