I just finished putting a new CAI and a 3.4" pulley on, now im wondering whats next. I was thinking since i upgraded the spark plugs a nd wires maybe coils would be the next best thing, any ideas?

you dont need to upgrade your wires or coils, stock are good up to a 12 second car, but plugs i would upgrade for sure to 104's, do you have supporting mods for that 3.4?

so you have just an intake and a 3.4? Have you read about KR at all? Your car is slower than it was when you started if those are your only 2 mods

Take the 3.4 off and do some exhaust work and tuning.

yes i do agree you need to check and see if you have any knock or anything

You'll need a 3" D/P, drilled 180* t-stat, tuning or a pre-tuned PCM, and Autolite 104 plugs.
And get something to scan with.

hate to be a moron but whats KR? also as far as exhaust upgrades, whats the most restictive parts? i want to upgrade but i dont want the car to be louder. and is there a good tool for scanning/ tuning?

Front exhaust manifold and stock DP are very restrictive. If you can't afford a DP (down pipe) at least get rid of the U-bend. The front manifold can be replaced with a ZZP P-log. You need to read all of ZZP Tech tips and learn about your GTP before you grenade that motor.

http://www.zzperformance.com/grand_prix/articles.php

Stock mufflers will support minor mods and keep it quiet.

http://www.zzperformance.com/grand_prix/products1.php?id=208&catid=110

http://www.zzperformance.com/grand_prix/products1.php?id=551&catid=110

http://www.zzperformance.com/grand_prix/products1.php?id=504&catid=110

So your saying its ok to change my front manifold but not the back? and how easy is the down pipe to install. i hate (and wont) bringing my car to the shop it looks like its a bolt on... but the u bend delete is a weld on? and i read up on the kr thing, i dont notice any knocking so far, all i have seen is that the idle is a tad rougher but acceleration wise the car is much faster, will the 104 spark plugs help at all?

Hi Zagnut,
If your Park Avenue Ultra is a 97-03, here's a couple of downpipe options for you to check out: ZZP and Ebay Iirc, your car doesn't have a U-bend. Hope that helps!

You are suppost to run 104 plugs when dropping pulley sizes, its a must, i would take that pulley off before you grenade that motor.

Thanks everyone for the info, i going to get the plugs asap and the rest will get shipped thanks again

You're welcome, hope everything works out well for you.

The DP & P-log are easy bolt in items. Just spray the bolts daily with PB Blaster or similiar for about a week before to loosen the rust. The rear manifold is not as restrictive and a serious PITA to remove. You will not hear the knock in these cars because of the antiknock sensors. They hear the knock and reduce timing, hence the KR.

A tip on the DP. Install all nuts & bolts slightly and ensure DP is centered in tunnel before tightening nuts & bolts. Somehow mine was off slightly and would sometimes hit when driving. I had to redo the whole procedure.

I reccommend reading more. You would know that you cant "feel" knock. Unless your car is a 15* and its really slow. It wont affect idle at all.

ok spent all night reading about everything and im left with one ? ive seen some people go with the autolite plugs other go with the ac delco 41-913, i will not be racing the car, i also hate changing the plugs in the car, obviously the platniums will stay in for longer will i be losing anything by going this route instead of copper?