Campeck

really?..............your right...having a permit doesn't mean anything does it?

Fishey

Well...
Time will tell us..

jp944

I believe I saw the Grassroots car on ebay recently. Maybe AutoTrader.

CPTdooberhead

stock headers on a 944 are great, theres no reason to replace them- I spent like $900 on my aftermarket GHL headers for the 951, but only because my stocks rattled and I was sick of it...

Skip

This thread was started by a 951 owner but changed to include the na. Be careful which you compare. OE headers are fine, but aftermarket ARE better. The point most will agree is how much better (is it worth it). The na won't benefit as much from the cat-lessness as the turbo will.

On the dyno...

My car (89 2.7l) gained 10+TQ and 7+HP with Bursch header (4-2-1) and custom 2.5" exhaust using two Dynomax Ultraflo mufflers (one where cat goes, the other in the stock location)

Shop owners car (84 2.5l) gained 8+TQ and 8+HP with MSDS header (4-1) and custom 3" exhaust using one Borla XR-1 (Borla sounded much better and has lasted longer)

I think the headers are a toss - except that I've "heard" several reports of the Stahl header being the best for the na (pricey though). 3" is not too big for a track na. 2.5" is great for dual purpose na. Turbos - well - 5" sounds good to start

IMHO... YMMV... BTDTGTTS...

Dave

Actually, according to his sig he's a 944S owner, all bets are off
Good info otherwise, Skip.

Geo

Hmmmm..... I'll bet a 944S could be made to make a fair bit more power with a header, IF you can adjust the cam timing. A friend of mine who is an automotive engineer believes the reason a header doesn't do much for a NA 8v 944 is not enough valve overlap. Apparently more overlap helps scavenging.

Manning

And what else? MSD ignition, chip, open element intake? Or were you running just those changes at the time, OR were those the increases for those changes on top of the MSD and chip, etc? Plus, where did those gains come in the the RPM range. Frankly, for a street driven vehicle, WGAF (that's Who Gives A F+ck for those who couldn't figure it out) if the gains are all near the top of the rev range.

Not trying to bust your ball Skip, just trying to figure out what's what.

Skip

oopsy-daisy... Sorry about that, Mr. Mitro

Skip

It's a fair comparison - That was with the K&N panel filter w/cut-top box, MSD ignition and with/without the chip (no discernable change, just higher overall with Autothority and GURU chips). The 84 944 got a cone filter intake in addition to the exhaust, but the 3" exhaust was a swag to see if it would do some good for the 4500-6500 range - appears to have worked. Not enough analysis to say that the na does not really require backpressure, but it works quite well none the less. This would require way to much idle curiousity and free time for most to consider.

I have posted the runs over the years - they're around here somewhere. Basically, torque came on higher quicker - as would be expected when opening things up. I remember recording as much as +15TQ at one point prior to HP peak (maybe 4000 or so). It pulls quite well - too well, even...

Hey! I still have both of them, thanks

Manning

Sorry, typo.

tifosiman

If you're insinuating that you are going to do this and do a dyno test, great, but that is a different story than doing this to an S or a 143hp 944 8v.

Maybe since you drive around on public streets all day at 7,000+ rpm, it will work out just fine for you. At least your exhaust will be louder, so that my loved ones and other innocent people hear you coming and can get off the road in time.

tifosiman

Hmm. That sounded harsh, when I meant it to be a bit tounge-and-cheek. Please accept this smiley.

xsboost90

yeah, i think 3" on an n/a is kinda pointless- unless your running some kind of freaky deaky engine settup. My turbo had a 3" exhaust and provided plenty of room for all that xsboost...hehe.. to get outa there quick. Opening an n/a up, esp. on the street just doesnt make sense- refer to bypassed exhaust on 924s at the track. Ill be getting rid of the cat is noticable, but you do need alittle backpressure.

Fishey

Tifo..... Your such a ****...

I actually spend my own money so others on the board will have valuable information when it comes to upgradeing (atleast there S2's) and all you do is bash me for whatever reasons.