top speed header

[bentusi123]

The increase power from cat back is minimal. The catback on the stock CL9 is optimal. Change your cat, that will give u some more gains. Go either magnaflow or rt cat
To get rid of the hissing, change the flex pipe. It doesnt cost that much. Im waiting for my topspeed header to arrive as well. Im just gonna change the flex pipe straight away to avoid any complications or issues with hissing.
Swap the flex pipe to a 2" x 6" double braided flex pipe as mentioned by Tony.
Im not sure where to source it from. Tried ebay but not much success. Anyone know?

what is the complications or issues with hissing?
is there any other funcation for change the pipe?

[aaronng]

Now that I have been back on my stock headers, I have to say that I do miss the Topspeed header. That gave good midrange.

[Crapdaz]

aaron, whats the news with getting your topspeed fixed?

[bentusi123]

Now that I have been back on my stock headers, I have to say that I do miss the Topspeed header. That gave good midrange.

why u change back to stock?
i was thinking, what happened if i put top speed header and stock flexpipe?

[aaronng]

aaron, whats the news with getting your topspeed fixed?

It will be fixed under warranty by welding in a double braided flex pipe. Do you know if they have to weld it while the headers are on your car?

[aaronng]

why u change back to stock?
i was thinking, what happened if i put top speed header and stock flexpipe?

You'll get a huge exhaust leak because the flange for the two parts don't match.

[Crapdaz]

It will be fixed under warranty by welding in a double braided flex pipe. Do you know if they have to weld it while the headers are on your car?

If your car is getting the flexpipe chopped off and then rewelded with double braided pipe then i think it would need to be taken out.

IMO my 2c (not worth much) but i think they would have measured the distance to the topspeed headers from where they cut it off to the flange>cat and they make sure your double braided flexpipe will be the same length to suit.

Reweld whilst it is off the car and then reinstall it back on.

[snYpz]

Well once i get my Topspeed header next week, i will change the flex pipe straight away. Not gonna mess around with the problematic flex pipe that appears to come with the topspeed and dc.

I called performance exhaust(/or mufflers?) at northmead and they quoted me $110 flex pipe plus weld i think.

I'll let you guys know afterwards when its done if any of you are interested

[tony1234]

It will be fixed under warranty by welding in a double braided flex pipe. Do you know if they have to weld it while the headers are on your car?

I'm sure they can weld on the flexpipe while the headers are still on the car.But haven't you taken the headers off?If so the job will be easier and maybe a bit cheaper.

[aaronng]

If your car is getting the flexpipe chopped off and then rewelded with double braided pipe then i think it would need to be taken out.

IMO my 2c (not worth much) but i think they would have measured the distance to the topspeed headers from where they cut it off to the flange>cat and they make sure your double braided flexpipe will be the same length to suit.

Reweld whilst it is off the car and then reinstall it back on.

They usually tack weld it on the car, then take it off to have it fully welded on. But since i have the headers off the car and plan to drop it off on a weekday, I will need my car to be with me. Oh well.... I'll bring up the issue of the leaking flange too.

[aaronng]

I'm sure they can weld on the flexpipe while the headers are still on the car.But haven't you taken the headers off?If so the job will be easier and maybe a bit cheaper.

Headers are off the car. My question was, do they have to do it while it is still on the car to get the best fit.

[tony1234]

Headers are off the car. My question was, do they have to do it while it is still on the car to get the best fit.

I think you would get a better fit with the headers still on the car.So yes.