please advise on exhaust

[AmadeusCharger500]

I am doing this for a friend. It is a challenger with 440. 9.125:1 compression. 1 3/4 headers. 3.55 rear. Newly rebuilt .030 over Stock iron heads, and he is adding a six pack on top.
I am assuming that 2.5 exhaust is the way to go, and adding a crossover pipe is good also.
I know almost nothing about brand names. I know mandrel bent is best. I can't even tell if these are mandrel bent.
Anyway, he wants to know if this system would be decent.
Can anyone please advise.

Ebay Item number: 130005677412

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=130005677412&ru=http%3A%2F%2Fmotors.search.ebay.com%3A80%2Fsearch%2Fsearch.dll%3Fsofocus%3Dbs%26sbrftog%3D1%26from%3DR10%26satitle%3D130005677412%26sacat%3D6000%2526catref%253DC6%26bs%3DSearch%26fsop%3D1%2526fsoo%253D1%26coaction%3Dcompare%26copagenum%3D1%26coentrypage%3Dsearch%26fmmk%3D%26fmmd%3D%26fylo%3D%26fyhi%3D%26mppfQy%3DStart%2Bnew%2Bsearch%26sargn%3D-1%2526saslc%253D2%26sadis%3D200%26fpos%3D18017%26ftrt%3D1%26ftrv%3D1%26saprclo%3D%26saprchi%3D%26fvi%3D1

[firefighter3931]

The exhaust in that link is definately mandrel bent and has an x-pipe built in....both very good features.  Magnaflow is quality stuff and 2.5in is fine for the combo outlined above. The mufflers are a true flow-thru design and not restrictive....the exact opposite of a Flowmaster "chambered" style muffler.

Ron

[AmadeusCharger500]

Sounds good.
Thanks Ron.