You have to check the bolt! I think you used the standard M8 bolt? It will definitely break! We drilled a bigger hole and used a M10... but it was also broken after one rally. Now I am using a M12 12.9 ...
Been busy today...I had my intake manifold ported and matched couple of years ago and since I've changed an engine. This one doesn't have a ported cylinder head ergo - the intake on the head and the inlet manifold ports didn't match. Till today.
Intake manifold:
Cylinder head, "ported" vs stock (the 2 on the right).
STOCK
"PORTED"
My idea was just to remove that "step" between the ported and matched intake manifold and the cylinder head. Of course, I blocked the passage to the valves so the aluminium residue doesn't enter the cylinder, and the rest I vacuumed with the vacuum cleaner.
Impressions? TBH, my butt dyno says that I have a better throttle response, and MAYBE some more kick at >5krpm.
Couple of mods left to do on the car this year (if my finances allow me to ) performance vise (custom intake manifold, head work and a remap). I believe I could squeeze out a 10-15bhp more.
And the next year I'll probably make/buy a lightweight flywheel and that's it for the engine. I believe/hope it'll be as fast as a Megane 275, and that's enough for me.