Thread: PCM or a TUNER

Greetings and salutations all! Tis a swell forum you have here.
I have a 99 grand prix gt(more research at the time of purchace and I'd be typing gtp here! darn it!!) lol. Anyways I really like the car but it's sad how the gm engineers and have it programmed. So I'm here looking for advice about Which tuners support the 99 gt, aswell as which brand pcm would be worth buying? So far from what I've read in the forum there seems to be lots of bogus reflashes. Also can someone explain the typical damage that a
L67 suffers when it comes apart?

Tuners- DHP Or HPT


PCM- overkill or intense.



If you're not going to be modding the car a lot just get a pcm. Or if you're not willing to learn A LOT about programming the stuff into you're car then get a PCM.


These aren't anything like SCT or similar tuner's.



Here are some screenshot's.

This is just a cupple. Excuse the writing examples as they were an example for something else.


Hope you can kinda get the feel of it with what i used.

Originally Posted by Bio248

each car is different. the best tune is a tune that had been done on YOUR car.

And I can't stress that enough.

Just this once.

Originally Posted by Bio248

high 12s on a cammed setup? lame.

Low 11's on an intercooled setup... Priceless....

Hello and thanks for the feedback. So where would a fella find a good used DHP and how much could he expect to pay

In the classifieds section. And you would expect to pay about 300-350 for one.


This is about the only time i'll recomend this site but try ClubGP's classified section. Thay show up a lot more there.

Is that US funds or Canadian?

My 99's bone stock, minus the removal of the resonator. The car's a daily driver that'll turn 100k this week. Bought it at 93k last fall. So in 7000k ive discovered that the factory programming is to keep grandma outta the weeds! I need a reprogrammed pcm but where I live being able to do it myself is imperitive.( pcm'd spend more time in the mail than in my car!!

so 4 and change in my dollars!