whats the difference??? H22a1 vs. H22a4 headers

[DrLove'sKuDang]

is there any?

if i were to get a header made for a 92-95 prelude, would it matter? i just want the header to properly bolt up to the cat, with the right spacing and flange, so it'll properly bolt up to the catback as well.

[customchord]

A1 Header
http://www.hondaautomotiveparts.com/...ST+MANIFOLD+(3)
A4 Header
http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD
A1 downpipe
http://www.hondaautomotiveparts.com/...EXHAUST+SYSTEM
A4 downpipe
http://www.hondaautomotiveparts.com/...XHAUST+PIPE+(1)

They have different part numbers but look the same.

[Flatline]

the header should be the same. the down pipe is going to be shorter for the A4 because the BB6 lude DP is shorter than the BB4 of CB7.