The best way would be 2 in 1 exhaust you should get the same ground clearance as the Z. On the other hand you will save more than half of the weight of the OE system which comes as a bonus.
However if you do not have the funds right now you can use rear suspension risers sold at OTR on-line they offer +35 mm. Unfortunately I have not seen fork risers on sale anywhere probably you will have to order custom made. This way you will not be able to get any of the above advantages apart of eventual increased clearance, of course.

Enjoy.

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that is how i feel about my XTR
Mods so far:
Hyperpro front springs; Hyperpro rear shock spring; modified air box; LED tail light; LED indicators + new relay; YZ pegs; Lucas aluminum bar; brisk spark plug; snorkel removed; DNA stage 1; second hand DynoJet O2 mod; crash bars; front and rear steel braided brake lines; soft EBC brake pads; mitas 07 tyres, 2in1 Metal Mule exhaust, Blocked AIS, tall OEM screen, OTR bash plate