Headers? Yes/no

[snaponbob]

Helping a friend with an E30 325i build. It is an 89 325i coupe. The car will be built as both (sometimes) street car and primarily a track days car. The engine is stone stock.

Although I think I know the answer, I want to share input with him about long tube headers. They are the cheap sort from e-bay. Front header has longer tubes than the rear header, and it came with an X collector.

Compared to stock manifolds and downpipes into a 2.5" single exhaust, will the headers help, hurt, or have no effect?

[JasonC]

The headers, are they individual flanges or are they full flanges? Also many eBay headers say they are long tube when they are actually mid tube design.

[snaponbob]

Individual. AND ------ they were poorly jigged up when they were welded. They would have to be machined to not leak. Pretty sure they are this --- http://www.ebay.com/itm/84-91-BMW-32...c0a2c1&vxp=mtr

[ncrmtrsprtsE30]

Individual. AND ------ they were poorly jigged up when they were welded. They would have to be machined to not leak. Pretty sure they are this --- http://www.ebay.com/itm/84-91-BMW-32...c0a2c1&vxp=mtr

i love in the main picture they have of the whole thing together, that half of the header is way off from being in line.. i have ones similar, i had to cut/notch/bend the x-pipe part of it so it would actually match up.. and its still garbage.. if i were you or your friend just use the 2 piece header and get a collector/x-pipe built properly with an o2 sensor bung welded in.

it helps at top end rpm power only.. little to no power change in low rpm..