hello all my question is if i could buy tyga silencers and install them on to my nsr mc21's stock chambers would it be any problem would any jetting be involved or can i leave it as is and just install the tyga pipes?

Drop Paul at Tyga a line - All the info is on their web site

If you keep the standard honda exhausts and want to add TYGA end cans you need a couple of these

http://tyga-performance.com/site/product_info.php?cPath=72_1036_79_112&products_id=957

Or

http://nsr-world.com/marketplace/product_info.php?cPath=26_34&products_id=69

HTH

Those adaptors are for the silencers.
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If I have to take the carbs off once more...