will running only an exhaust manifold harm the engine?

[revan_vs]

i understand that having no manifold ruins the valves but would it be acceptable to just have a manifold? Or would it be better to cut the pipe jst after the cat? any help would be appreciated
Sorry iv tried searching but no luck

[Sabbath']

Your car will be loud, but slow.

[revan_vs]

would there be any point in doing this to a stock track car? (power wise)

[HARVZ-6]

a na engine needs the backpressure to run properly and prevent the valves burning out

[revan_vs]

so best 2 jst hav standard system and take out muffler? or?

[HARVZ-6]

what sort of motor are we talking?

you need the exhaust pressure because it takes the heat away from the valves

[revan_vs]

say a 1.3 3k old corrolla engine
would it matter if it had extractors?

[revan_vs]

cheers anyway guys

[HARVZ-6]

extractors will make the biggest difference exhaust wise...

your best bet is to try different setups an see what gives the best gains to suit your needs

[revan_vs]

yer but wold there be any point cutting out the muffler then?
being its already got extractors and 1 muffler setup