exhaust help please quick

modify i.e cuting the tips off and then it would go on. whts it like mate anygood?

cut off slash pipes and would need some straight ends to go in the 200 exhaust funnels on the diffuser

the exhaust looks in good condition from those photos
 
been to pick this exhaust mate could you please tell me were i should cut it and how long the pipe should be tht i need to put on many thanks rich