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This is an example of another car but according to my standards,this is how a custom made exhaust system should look like.;) http://i77.photobucket.com/albums/j75/DruliC/29052006012-1.jpg http://i77.photobucket.com/albums/j75/DruliC/29052006009.jpg...

Exhaust sustems that have more curves than another with more straight design,are more restrictive. The more straight designed the exhaust has,the better flow you get.;) Check the Orbisoud. The internals of the backbox are in a straight line compared to the rest of the system. If you choose...

Sorry,misunderstood...:( It has so many connections that ruin the flow of the exhaust... I think it is called "turbulence flow" if i spell it right.:dapprove:

Could be better...:rolleyes: I will agree with Rich that the welds could be much better...:(

Ben don't forget about us,we are waiting...;)

Oliver you 're killing me man...:D Did you also used to work for Renault Sport and you are hiding from us?:rasp:

I know that i could get much more from a gas flowed head and a remap than simply changing the cams but the problem is that where i come from,no one has a flow bench to do that work properly so instead of spending 400E to someone who will probably do nothing to the cylinder head(or even make it...

Yes,i know,but the cost is almost the same to remap the factory ECU or use the Cats with the OEM mapping so i think that the Cats will give something more at high revs than a remap... Certainly the remap will have a much better mid range but it won't be able to "upgrade" high revs(5500+)...

I'm thinking of using the group N set of Cat(5502702) to my K4M...:) http://www.catcams.be/800x600/prod01Adata.htm?PN5502702?PN55027xx.js I hope that they won't need an ECU remap and they will give a small "boost" at high revs...

Yeap,i believe that 11:1 is ok than the standard 10:1.;)

Oliver you can simply use a thicker head gasket and drop the compression ratio to where you want to.:) Awesome Clio man!!!;)

This is the old RR with the goodies mentioned above.:) http://upload5.postimage.org/123570/photo_hosting.html

When i will finish with my friend's 172,i will try to upload a RR. I hope that it will keep it's power till 7400 and make the peak somewhere around 6800-7000.:) The only things that it has right now is air filter in standard airbox,mapped ECU and 55mm exhaust with sports cat(100cpsi).

Too much money and a lot of time loss...:dapprove: Better get an RS instead.:)

I got exactly the same engine K4M.;) The idle will never be stable at all because of much bigger overlap of the cams. The bigger the lift at TDC,the greater the overlap is.:dapprove: The only way to make it better is to use high compression pistons which is rather expensive thing to do...

So i suppose that you had the same set up during the RR you mentioned above...:) Great job!;)

The 5502420 are the ones that are made according to the group N homologation sheet so they should work perfectly even without an ECU reprogramme if,according to what you say,the 2428 work OK with oe ECU. The 2428 has exactly the same exhaust cam but slightly wilder inlet cam. I ordered the...