I have a few questions:

1) Is it worth getting the JWT ECU modification? WIll that improve acceleration? What would be an estimate of hp gain on a bone stock 99 SE-L 5-spd with the ECU modified? If not JWT, what else is out there?

2) Will I notice increase in speed if I get a y-pipe even though I have a stock airbox (I don't want an intake...don't ask...I just don't)?

3) Should I get the ECU modified before or after getting the y-pipe? I heard a lot of fuss about them adjusting the ECU to the mods you have on the car, but is that necessary? What if I get rid of my y-pipe, I have to mod the ECU again?

 

JWT is for 95/96 only. Y-pipe will give noticeable gains even without an intake.

 

intake is a neat mod!!!

 

you can do the mods before or after. The ECU will need to be reset and recalibrate to your mods the first few minutes powering back up

 

Yep - he has a 1999 - He can't get a JWT ECU anyway as I understand it.

 

The JWT ECU program is the same whether or not you have an aftermarket y-pipe or not. They just use an NA program. The different program only matters when you have s/c, tubo, NOS.

But if you do have a 1999, you cannot get a JWT ECU either way.

 

99=sol


1234567