Umm Dallas... we're going to have a problem here... I'm telling you this from the get-go. NO, to the pipe. Although I'd like to see the results... Just about nothing beats a heater core for overall cooling capacity. They are designed to just what they do best, DUMP heat and heat yer ride up. Check out my Chevette heater Core Extraction how-to... Took me about 10-15min with some simple tools... Good luck!
BTW-where did you get that sexy looking Y-splitter?! Homedepot and Lowes don't carry anything of the sorts... just overpriced T's! Nice shorts too! lol 
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XP 1600+ AGOIA-Y (GreenLabel, UNLOCKED!@/ NF7-S 2.0/ PC 2700 DDR
10.5*172FSB(1806/ 1991 high), Vcore 1.792...@84.95Watts
--86' Chevette Heater Core
--1/2" Vinyl tubes
--Via1300-Stealth Mod(QUIET!) 
---Home made copper-tube block
---PVC small internal res
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