Quote:
Originally Posted by Horrgakx
Nonetheless I have emailed 3 companies asking if it's a user-changeable part, as most they tend to be a 700-mile round trip.
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Of the ones I browsed at, they state 'custom' upgrades, which to my limited knowledge of tuning involves them 'tweaking' the map files on the car in real-time. For the limited upgrade potential available, say ~10%, for me it's not a financial option to gain around ~20hp from a 260hp engine. Likewise, for the W12, ~50hp for £1k doesn't make sense to me.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs -
Replaced alarm horn,
Replaced Coolant Temp sensor,
Updated RNS-D firmware,
Installed Reversing Camera and Digital TV,
Dashcam Installation,
Retrofitted Rear Blinds,
Auto-Dimming Rear View Mirror,
Chrome Boot Struts
Sold! 
2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs -
Fan Jet Windscreen Washers,
Retrofitted Electric Side Blinds