Please help about tuning Derbi DRD SM Limited Edition 2005

I want to make middle-level tuning on my derbi.
And that's i choose:

1. Exhaust: Metrakit PIPE "PRO 70 THROWER" 866D0432 TU/D 774203 Pro 
http://www.metrakit.es/english/technical_card.php?codigo=866D0432

2. MALOSSI ALUMIN-CYLINDER KIT Ø 50 H2O MHR code = 3113221
http://malossi.com/Catalogo/Cata_Main.asp?Marca=80&Modello=MO/DEDRV50&Famiglia=0&CodArt=3113221

3. RUBBER INT. MANIFOLD KIT Ø 21 MHR code = 2013235
http://malossi.com/Catalogo/Cata_Main.asp?Marca=80&Modello=MO/DEDRV50&Famiglia=0&CodArt=2013235

4. Dellorto carburetor 19mm

Is it right choice?
Should i change some spares more?
Should i change crankshaft on more strong?

Thank you!

hi ..

 

i recommend for a mid-level tuning

1. M3212613 malossi pipe

2. M2013235 manifold

3. D02695 carb.

you can use the old crank ....

 

maybe its good to change the bearings and oilseals