Supercharger route
hats off to Mike but first, £4000 is a lot of money. Second, make sure you live close to Jamsport cause these conversions are never plug n' play and third, you'll never be able to sell it. Modd'd cars never are. Forth, would like to see one will a few km done trouble free before parting with my hard earned. They do 'sound' pretty special though!!
R26 engine transplant
Only one done in a R27 to date (to my knowledge). Many have failed. The owner done it himself and states it took 300 hrs plus mapping to engineer. That equates to 5-7k garage time. I recon parts could easy come to 2 grand anyway....Does give you 270bhp with a map but again make sure you live close to the garage who fitted it and get use to being without your car for long periods throughout the year...
V6 Airbox & cam
My current plan is V6 airbox, ported and polished inlets, would like to 'cam it'...remap and then put the 4 grand into a Renny R26 F1 in white (modd'd 270ish bhp easy..) or a Renny 250 (£400 remap alone = 305bhp) in a year or so. I recon 15k with buy a good un'....
Food for thought....How many modd'd cars on here are being put back to standard within the last 3-6 months. Quite a few. The forum can be a modders grave yard.....Previous petrol heads have got bored with the clio lack of grunt and won't pay out 5 grand grand for 260bhp. Those who have I think have regretted it....when a remapped FR, GTI, S3, VXR or R26 with give you that and more for 400 reliable pounds....Can you imagine putting 4 grand into a R26...350bhp maybe....