so i emailed rotary performance (rx7.com) about my EGT purchase. they suggest the downpipe, NOT the manifold. this is good, b/c i didn't want to go tapping into my wastegate or something and screw everything up.



now its just a matter of finding out what size the tapped hole needs to be. the directions are quite unclear on the tap size...

measure it

i dont have a dial caliper.

Just find a nut that is the same size and thread pitch and drill the hole and have the nut welded to the top of the hole. Kind of like the bung for the O2 sensor.

good idea, but i dont have a welder. i have a tap and drill, but no welder. i'll get it in, just a matter of time

egt is bs.

why do you say that?

the downpipe probably isn't thick enough to tap... the nut welded on is probably best.



the manifold *is* better. but alot harder as well. and if you have an S5. you'd need 2 gauges...

the DP might be too thin to tap. welded on nut is probably best.

egt are just a rough measurement of the air/fuel ratio....

Get a wideband o2....