flat spot

Hello everybody.. I just did a litle engine "rebuild" on my 197. Reason - oil consumption and huge blue smoke clouds on 4500k revs and up... - So crankshaft bearings, piston rings, valve seals, did valves with paste, did the "grinding" of engine head ( hope google traslate did the job...

Hi, I am looking at buying a Cobra Cat back system with a sports cat for my clio rs 200. I am wondering if anyone can comment on the flat spot issues I've been reading. Will a sports cat increase/create a Flat spot? Will a cat-back exhaust system increase/create a Flat spot? Is a...