Hahahah...personally I think it's not as cool as you'd think.
IF You need a new muffler, and it's quieter than your old one, then sure, why not.
IF your getting alllll the piping done, than sure, you can always change it later.
NOW, if your old muffler is in fine, shape, and all your muffler tubing is still very very small, your only going to make yourself look like an idiot. and yes, your car will be rice.
Why? Because you won't be gaining any power out of it, it will probably sounds raspy and terrible, and it's a huge, fart, can. Honestly, never been a fan.
Mind you, depending how ganster you are, you might be able to pull it off haha
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