Could I use a tuned header and muffler from a trx 2.5 as a upgrade for my trx .15? Do the ports match up? Thanks

The pipe will but the header will not since the 2.5 has a rear exhaust and the trx .15 has a side exhaust

so it can be used as an upgrade? does it flow better than the stock .15 muffler? I can custom make the header. Thanks