what else shud I get? help me
If posible name me a few things
Free mods are...well free

Are you M6? A4? If M6 try a new shifter, master/slave cylinders with the drill mod. A4? Converter/cooler will be your best mod
Some wouldn't call those bolt ons, but they are not very hard to do
But if you're goals are under 400rwhp a lid, filter, ported tb, and LS6 intake would suffice for inductions mods. You can also get a ram air in which case I would recommend SSRA cause it won't heat soak like FTRA. Pullies are another bolt-on but they're not exactly related to induction. Suspension will also help for off the line traction and stability through hard turns.
For exhaust you can get a cut-out and have it installed for under $100. Or go all out and for about ten times the price get LT headers, and a thick mid-pipe. I don't think any options in between those price ranges will really net you good hp/$ ratio.
btw, I would recommend any of the free mods (unless you count ported tb.)
Then you can get cammed, or H/C, or any choice of power adders.
edit: new bellows and MAF are pretty pointless unless you're making tons of power and the stock peices are actually restricting airflow.
Then it's the next level, heads, cam, etc. The only limit is your budget
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The bellows is primarily an appearance mod, do it if you want, but don't expect to feel a difference
As for the MAF, unless you have 500 (or more) hp the stock one flows just fine

