I've been debating over weather or not to get a Grand Prix GTP or a Bonneville SSEi. Other than little changes due to the cosmetic differences of the two cars, are the powertrains pretty much the same? L67 w/ Eaton M90 supercharger, correct?

Yup, the powertrain is the same. I noticed you're sig and with either the GTP or SSEi you'll destroy Kris'* Hemi Ram while getting 25mpg.

I think it depends on the year with Gen */C you get, although I dont think the H/P is any different, I dont know a whole lot about the differences between the Gens, so dont quote me on it. Why not post the years you are looking at.

*NUR* sorry, that would have been helpful, huh? I'm looking at the 98-2003 Grand Prix GTP, or a 2000+ Bonneville SSEi.

And yeah, Kris likes to talk big about his Ram...but he'* about to get a rude awakening

If your looking for power and overall times get the GTP.

The SSEi is a better car with more features but is hampered by torque management, heavier body, and taller tires making it run about 1 second slower than a GTP in the 1/4 mile (initially anyway )

Some things the SSEi has over the GTP is a better exhaust and the stabilitrak system.

Depends on your over all goals.

BTW, I'm not to far from Toledo if your Ram friend ever wants to have his truckbed handed to him

Haha I'll remember that, Rouge. I wanna smoke him first though...then I'll let you add some insult to injury . He won't be doing too much talking come spring time...hehehe .

I'm not all that familiar with how superchargers work in comparison to turbochagers (which I know a little about, but not alot). Do they employ any kind of a blowoff valve to vent excess boost? You'd think that since boost is directly affected by RPM, then one wouldn't really be necessary since as soon as you lift off the throttle, boost would drop off, too. But nevertheless, I don't have a clue...so if someone could enlighten me, I'd appreciate it.

Our roots type blowers employ an intergral wastegate valve operated by a vacuum controlled actuator. It would make full boost all the time, but...

Depending the amount of vacuum behind the throttle plate, the actuator opens the valve accordingly. If you let it idle, creating the most vacuum, the valve opens all the way (-10 pounds or so). If you floor it, releasing the vacuum to atmosperic pressure, the valve closes all the way, creating max boost. And any level in between. When dumping the boost, it goes back into the intake before the SC.

The 2000+, yes. The 96-99 SSEi only weighs 100-200 lbs. more than a GTP. Heck,even my stock LSS which is tuned for luxury ran a 15.1@92mph stock. That was with a 2.4 60 ft. With a 2.2 60 ft I would of broke a 14.9 maybe even a 14.8. Ryan (SsuperchargedEi) ran a 14.9@95mph with a 2.3 60 ft bone STOCK!! Thats as fast if not faster than most GTP'*. Trust me, get a 96-99.

Well seeing as how he stated

I stand by my statement

Just goes to show how much I can read when i've been drinking.