HERE I HAVE FOR SALE.... A VAC ADVANCE KIT FOR CARS WITH LUCAS MECHANICAL FUEL INJECTION Pi, AND USING A 123 TUNE IGNITION DISTRIBUTOR. TRIUMPH TR5, TR6, T2000 2.5PI MK1, MK2... AND OF COURSE, ANY HYBRID SPITFIRE OR GT6 USING LUCAS PI..THE 123 TUNE DISTRIBUTOR HAS AN ELECTRONICALLY CONTROLLED VAC ADVANCE SYSTEM.IT ALLOWS THE USER TO DEFINE ALL AREAS OF THE VAC ADVANCE.RUNNING VAC ADVANCE IS PREFFERABLE ON ROAD CARS FOR 2 REASONS..-IT ALLOWS A VERY SMOOTH LOW TICKOVER AT IDLE.-AND ADDS MORE ADVANCE WHILE ON CRUISE..ADVANCE ON CRUISE ALLOWS THE ENGINE TO BECOME VERY EFFICIENT, NEEDING ONLY SMALL AMOUNTS OF FUEL AND AIR TO MAINTAIN THE SAME LEVEL OF POWER..THE ONLY LUCAS Pi EQUIPPED CAR THAT HAD VAC ADVANCE WAS THE MK1 2.5Pi SALOON..BECAUSE THE ORIGINAL VAC SYSTEM WAS MECHANICAL, IT WAS IMPOSSIBLE TO CONTROL ON ENGINES THAT PRODUCE A VERY LOW VACUUM REGISTER, LIKE Pi.. THATS WHERE THE 123 DISI COMES IN TO ITS OWN..BECAUSE ITS ALL ELECTRONIC, YOU CAN REDUCE THE ADVANCE TO ZERO UNDER DECELARATION,THIS PREVENTS THE ENGINE GOING SUPER EFFICENT AND CONTINUING TO MOVE FORWARD AT UNDESIRABLE SPEEDS.MY OWN 2.5Pi SALOON HAS ATTAINED 34 MPG ON LONG DISTANT CRUISES..I USED TO GET 22 MPG................THE KIT PLUMBS STRAIGHT IN TO THE METERING UNIT VAC PIPE..THIS PIPE IS ONLY INCHES AWAY FROM THE DISI, SO KEEPS A NICE TIDY & DISCRETE SET UP..NO NEED TO RUN THE VAC PIPE ALL THE WAY OVER THE TOP OF THE ENGINE TO THE INLET MANIFOLDS. HAND MADE FROM ALUMINIUM , WITH QUALITY VAC FITTINGS..IT TAKES 30 SECONDS TO FIT..PLEASE NOTE................  THIS WILL ALSO WORK, TO A LESSER EXTENT ON THE STANDARD 123 DISI.THE STANDARD 123 HAS AN INBUILT HIGH VAC CUTOFF.. THANKS...     TRIUMPHSTUFF...