l wanna have that fire on my muffler during l slow down, break, shift up, shift down and switch the nitrous.

That fire that u see coming out of the exhaust is when the car backfires. In order to get that to happen, you'd have to put a full exhaust system on it, including, removing the cats off the car. For the Impreza, since you're running high grade fuel in the car anyways(and if you're not, you're suppose to because it is turboed) a full 3 inch exhaust would be great for the car. Take it to ur local muffler shop, get an estimate & tell them that u want a full 3 inch exhaust & if they'd remove the cats. The cheapest way to do that though is off of ebay. And after u install it, whenever u shif at high rpms, or what not. downshift, it will backfire here & there. But when removing the cats, you're check ingine light will appear, but there r things u can do to make it shut off.

So you want a fire all the time. Good luck with your insurance and with the police. The only place this would be allowed is on a closed track with lots of support staff (and an ambulance) standing by.

you can add a cherry bomb to the tail pipe, along with a fire reguator, both can be bought at most auto parts stores, you might have to special order them

add a full exhaust and take off dakats

you need this in order to do that, but if you car still has a Cat on it then you wlll most likely kill it so it is a good idea to get a full exhaust sysytem which does not have a cat.

http://charlescharlescharles.com/performance/beer2.jpg