No such thing as mini turbo.
Want mod car but does not affect FC??? -> you're kidding me right.
Optimal Performance Zone = Remap the ECU
He wants to hear the exhaust sound but want to add sound proof? -> I cannot brain this.
Fire came out from exhaust? -> need to mod the exhaust and put a fire spitting system there. You don't want fire spitting out from the car, trust me..I have been there and it is not good for the engine.

then simple mod will do like changing air filter, change bigger intake, remap and change exhaust, that's it.

Yes, it is possible to do it.

http://www.akamoto.co.uk/flaming-exhaust.asp

It doesn't damage the engine lah. It probably damage your exhaust. Detonation occurs after the engine mah. You just need to run the car rich, rev kaw kaw and poof, a bit of fire at the exhaust. Like cannon. (unless your engine timing is totally out)

if you want fire? get the dragon flame thrower kit, its a kit which sprays fuel to the exhaust and detonate the fire at the end with a spark park. All these controlled by the box which corresponds to your engine rev, you rev, alot of angin, it sprays and spark out flame, you see great flame in full glory.

You want power but you want less FC. where can bradder. More fuel more power mah. The only thing you can work on is to get the efficiency as optimum as possible. Meaning to say, your engine will burn every drop of fuel efficiently and convert it into kinetic power. This is why tuning is essential.

We give a gazillion ideas but at the end of the day, it bogs down to budget. How much are you willing to spend?

Eh bro so how was your Myvi vs GTR race?

How much is little? What if your engine is already running at its optimum, but you spend alot of money yet don't feel any difference? Its all about your target. For example, 10% improvement (say 10hp) on your car feels nothing as compared to mustang's 10% improvement (45hp). Next is the question on powerzone. If you target high HP, high power band on the high rev, you will suffer low torque. Making it unpleasant to drive because you need to rev kaw kaw. Now if you mention practical, you target your powerband to hit high on early and mid rev range, making it awesome to drive on the road, but loose out on drag race and top speed. Which is why cars need to tune in accordance to track requirement. There is no one setting which fits all. Its down to the driver's need. FC for gen2 auto is nothing. Once I got my car run 17L/100  . Next is on danger zone. Do you mean the peak of what the engine block can offer or the tip performance of the stock engine?

My advise, choose either one mod to begin with. Not all at once. 20k isn't much. basic SQ or PL Sound system and bodykit would consume all 20k budget. Car performance? 20k is so so only. Don't forget the upgrade all essential parts such as brakes, suspension and cooling component.

Btw, Where to get inspira for 60k?

Errr...
Inspira...

What makes u think Inspira is a Kereta Sukan?

No chance at all. On straight downhill, he got more mass & weight which is an advantage. He got more HP, means even more advantage. The only you can cucuk him, is when you have skill, balls of steel and drive through twisty roads. Still want to beat him? replace the engine with a 4G63T. It will solve all your power problem.

This is a /k/ thread leh 

Challenging a 4wd(with FR characteristic) using a point a-to-b car? 

Is our education system really gone that bad until the logic is screwed?

We can name alot of cars. Question, do you have the budget and cash to own it?

if you have the skills i assume an ek9 would do but i dont think you have it since you started such thread and previous thread so your best bet would be god VIOS TRD   

Ehem2...

Ts,

u shud get Vios TRD...

faster than everything...

when you do that please do consider about others that use the road
and you really watch too much of Initial D