Problem solved..... Just opened those pipes up a bit more and seems to be working good. No sealant, no leaks. Just took it for the first spin round the block...... I like the 300 already.

Thanks for your input.
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MC21
04 NSR50R
93 CBR F2
98 CBR F3 track bike
95 VFR750
89 FL400R Pilot
90 FZR 4/600