BGP and asymmetric routing

[xeb]

Hell!
I have following routing scheme, gw1 and gw2 - linux based routers using quagga:
<ISP1>-----[EBGP]-----<gw1>---[IBGP}---<gw2>-----[EBGP]-----<ISP2>
the problem is in asymmetric routing (then packet received from ISP1 transmits to ISP2 due to best path by bgp) and many routes is unaccessible by my AS. The question: is it possible to force reverse path (reply) of packet through interface it was received,ignoring bgp routing table, and which way ?
Thanks.
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