it increases plenum size. for what they cause in leaks vs. the hp/track times they gain they are HARDLY worth it. i see no need to replace the stock elbow. the ribbing isnt any hurt in flow and does effect anything. the bottle neck is the small air inlet on the 1994 gto. if your gunn a cheap it out and do a kn drop in. pull the box and cut the air inlet larger and stick the box back in.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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