3,2 exhaust question

[Muffler]

Hi all - I just got my 911 3,2 carrera ´86 from USA.
It has a CAT of course and 207 HP - I want to make it a Euro model with 231 HP which is legal in DK where I stay. Do I have to change the exhaust system totally or is it just to remove the cat and put the "cat bypass" thing on ?

Thanks
Anders

[rib]

Hi Anders, If you have some money to invest in your car, why not go the whole way. Get a Steve Wong chip, modify the air-box and put the SSI heat exchangers with a muffler, (I prefer the M&K 2 into 1). That will make a huge improvement to the performance of your 911.

If you dont want to spend that much. It would be a good start to get rid of the Cat and bypass it. I would also get the Steve wong Chip, for the best bang for your buck around $500.00 for the both.

If you need more info I will be happy to help.

Porsche 911 Carrera 3.2 1986 (Euro Spec)
Steve Wong Chip
Modified Air-Box with BMC Race Filter
SSI heat Exchangers with M&K 2 into 1 Muffler.

[Muffler]

Thanks for the suggestions - I still wonder if the cat is the only modification from euro to usa model on exhaust system.

[e-speedster]

Hello & no

The US spec has lower compression than the 231 hp ones - so the pistons need to be changed as well - then you might as well go for a 3.4 set up.......

Having owned both - the 231 hp is far "peppier" as we get 98 octane fuel here in norway - bet you do that in denmark as well

[Burint]

Anders,
I have the same question which I would like to know about the cat bypass too.
This is my 84, 3.2 USA spec on the 1970. I have a pair of the 964 cams, ported/polished. The muffler are copy of the 2.8 RSR+2in one out MK.
The muffler is a bit loud for street use but gives me goose bump on the track.

[Zef]

Originally Posted by Muffler

Hi all - I just got my 911 3,2 carrera ´86 from USA.
It has a CAT of course and 207 HP - I want to make it a Euro model with 231 HP which is legal in DK where I stay. Do I have to change the exhaust system totally or is it just to remove the cat and put the "cat bypass" thing on ?

Thanks
Anders

You'll get no gain by simply remove the cat...if you go that way...put a free flow exhaust and a SW chip burned for that application.
www.911chips.com

[KFC911]

Originally Posted by rib

Hi Anders, If you have some money to invest in your car, why not go the whole way. Get a Steve Wong chip, modify the air-box and put the SSI heat exchangers with a muffler, (I prefer the M&K 2 into 1). That will make a huge improvement to the performance of your 911.

If you dont want to spend that much. It would be a good start to get rid of the Cat and bypass it. I would also get the Steve wong Chip, for the best bang for your buck around $500.00 for the both.
....
SSI heat Exchangers with M&K 2 into 1 Muffler.

From my understanding, the SSIs are a bit too restrictive for the 3.2s, so one doesen't get the "bang for the buck" that they provide for the earlier cars, and do you need heat? . That said, your '86 stock chip has conservative "mappings", so just swapping to a '87-89 stock chip would give you an additional 10 hp. I've been running a Steve Wong chip for over five years...mapped for a sport muffler, euro premuffler, and 91+ (US) octane, and that will get you close without spending big bucks. I've done the airbox mod too, but since that isn't a restrictive component on the 3.2s, only the sound changes (I like it), but has no effect on hp. Bottom line...sport muffler, euro premuffler, Steve Wong chip and you'll be close without breaking the bank. Hope this helps...

[Oregon Cab]

I also have a US 86 and put in a SW premuff chip, Dansk Premuff and B&B muffler. I went back to the full stock airbox as recommended by SW. Those back clips are a b*tch or I am the worst wrench in the PNW. But I do like the stock box as it civilized the B&B interior sound just enough to what I was looking for over stock. The premuff and Wong chip were an instant OMG and a must have. Too soon to know if the sport muffler added much.

Steve Wong put this on the board recently and it seemed pretty clear.

[Muffler]

I think I get it - the compression is lower on us models: 10,3:1 compared to Euro model 9,5:1.
The exhaust system is the same apart from the Cat.

I will go for the Steve Wong chip and Dansk premuffler...

[Muffler]

a few pics

[Oregon Cab]

After a weekend with my B&B 1in-1out I believe I have more low end torque and higher speeds at lower rpm.I also put on the stock airbox with no ill effects over the cone kit. Sound is like a muscle car with burble and growl. I'm in love.