Muffler swap...should I do it?

[clubhead]

Originally Posted by IceBox

.... (though the techquipment sport exhaust is what I really wanted, but at @ $1600 that was more than I wanted to spend.) ...

You need to check out ebay. There're usually brand new ones going for about $1,200. Brandywine (www.brandywineporsche.com) has some on clearance. Call them to find out directly.

[Adam]

Clubehead, I know you have an 02....but do you think one pair of the factory cats is eliminated with the Dansk header/cat combo on 03/04's. If so, I think I may have to relocate one set of sensors. I did some reading on header swaps at work and it looks like it only takes an hour or so to do the job as well.....I was pleased to see that. I'm not sure about the install time on the cats though.

[clubhead]

Originally Posted by Adam

Clubehead, I know you have an 02....but do you think one pair of the factory cats is eliminated with the Dansk header/cat combo on 03/04's. If so, I think I may have to relocate one set of sensors. I did some reading on header swaps at work and it looks like it only takes an hour or so to do the job as well.....I was pleased to see that. I'm not sure about the install time on the cats though.

Yes, the Dansk headers will no longer have any cats on them so you get rid of the cats on the stock headers.

The header swap is pretty straight forward PROVIDED you've a manual which I know you do If it's a tip like mine, the right cat will touch the tip gearbox and some bending & grinding will need to be done

For cats, if you've all the proper clamps, I think it'll take about an hour?

[Adam]

I was thinking about an hour for the cats too....just some clamps and elbow grease. I think I will just leave on the stock exhaust since there seems to be no real power gains from swapping it. Plus, I think maybe dansk headers/cats/ and muffler may be a tad too loud so leaving on the stock muffler with the other two mods will give a nice increase in sound .....but not too loud. What do you think? Also, did you say you got 238whp with just the cats and headers?

[clubhead]

Originally Posted by Adam

.....but not too loud. What do you think? Also, did you say you got 238whp with just the cats and headers?

I hardly notice a difference in the decibels with the Dansk headers & cats My mechanic did tell me there was a slight increase in sound though.

I'm looking through my dyno report now. I may've made a slight mistake in my report I got my baseline dyno with the headers printed in bhp but the subsequent one with the addon cats in PS! I just need to go back to the dyno shop and have them re-print a bhp one for me.

Anyway, the max PS with the cats/headers is 239.6ps.

PS increase only happens from about 4,800rpm. There was torque loss < 4,800rpm. But both PS and torque increased after 4,800rpm.

I know this contradicts my initial report claiming there was torque/bhp increase throughout the rpm range..... I'm still trying to figure out what happened. I will amend my original post and attached a graph.

[Brucelee]

"PS increase only happens from about 4,800rpm. There was torque loss < 4,800rpm. But both PS and torque increased after 4,800rpm."

Am I wrong or is this a bad trade off for most street driving?

Seems more applicable to track racing.

[clubhead]

Originally Posted by Brucelee

"PS increase only happens from about 4,800rpm. There was torque loss < 4,800rpm. But both PS and torque increased after 4,800rpm."

Am I wrong or is this a bad trade off for most street driving?

Seems more applicable to track racing.

Yes, I would agree on the part of this being a bad trade off for most street driving. But 4,800rpm is still considered mid range, not something reserved mostly for track racing. That would be 6,000rpm and above I take my car to about 6,000rpm once a week or when I want to feel the rush Things would've been more acceptable if there wasn't any torque loss < 4,800rpm.

I'm still trying to figure out why I concluded there was bhp/torque increase throughout the rpm range in my dyno report on the cats back in Jan.