I don't think that answered my question.

i have those tips on my car. But black Chrome There Bad A$$

If you get those tips, at least spring for some type of dual outlet muffler, otherwise I wouldnt even consider tips with stock single outlet muffler. Or actually, looks like the 2000+ Bonne'* can run two mufflers, or am I wrong?

i plan on a 2.5 cat back with dual mufflers

2 mufflers will fit very comfortably, SOO much space available, an 80 series ( F body style wont fit tho, the spare tire well is too deep for it, but thats ok, i like the 2 muffler idea better

Is a cat back really going to be beneficial? I have heard some negavtive comments about that setup in general. But yea, get those tips!

i dont know off hand if the bonnie has a u-bend, if so i will also be eliminating that. Im not too concerned abou the performance since its slow, i know its slow and it will always be slow. my plans for the car are just 1.9 rockers PCM and a shift kit. Im more out to dress it up and make it loud than go fast.

You should look into Headers as well. I heard they are pretty loud. Do you got the air intake modded up allready? Make sure to do that, so the exhaust is running at full potential

i havent gotten to enclosing the intake yet, its just an open cone on the end of the intake bellows... Im going to the dyno next weekend to get some baseline numbers, to actually see if these mods REALLY change anything.

The numbers and gains are going to be different on every car. At most you can see if they did anything to your car. Do you go the stock dyno numbers? And not from a magazine or something