bolt on dual exhuast

[loscochinos520]

I am thinking of buy a high performance dual exhaust bolt on system from LMC Truck magazine. http://www.lmctruck.com/pdfcatalogs/...39CC081-98.pdf
It seems pretty cheap $179.99

Heres what lmc said about thier dual exhaust product:

With 2-1/4" tailpipes, these Dual Exhaust Systems reduce exhaust restriction
and back pressure for increased horsepower and better fuel economy.
Complete with bolt-on connectors that adapt to your stock manifold ... no
welding necessary! All parts and hardware for standard installation are
included. The standard stock exhaust system of a truck with a 350 engine is
a single 2-1/2" pipe. This means that you will be getting an 80% increase in
exhaust flow, increasing horsepower by up to 18%, improving fuel efficiency
and low-end torque at the same time. Increases in fuel efficiency and
horsepower are based on a truck operating at factory specs.

My question is has anybody ever purchased and installed this product. And if not how difficult do you see this being for a backyard mechanic. Is there anything i should be aware of when attempting to install my self. Seems pretty easy, just bolt it on. Any help and/or advice would be much appreciated.

I own a 87 chevy blazer 4x4 full size. 454 w/ 4 barrel carb. 33s on 6 in lift. Thanks for any help