Top Speed Bypass pipes initial impression

[jrcui]

Just ordered a set and they are back in stock. I have a NHP exhaust so looking forward to see any additional gains and sound.:dance::dance:

[The French Dude]

Excuse my ignorance, but catless cars are legals or not ?

[taiapkpro]

Di?n dÃ****n nÃ****y hay quá, Mình lÃ**** thÃ****nh viên m?i, m?i ngu?i giúp d? nhi?u nha

[woodsman]

Originally Posted by The French Dude

Excuse my ignorance, but catless cars are legals or not ?

Most of these cars have 4 cats and the computer only monitors 2 of them. I don't know if you can legally remove 2 but the odds of someone noticing are next to slim.

[The French Dude]

Thanks Woodsman !
I'll consider the mods so...

[edc]

In the UK we only have the 2 main cats, none in the manifold unless you have a 987.

[Ian c]

And this is what I thought about doing ...
Race headers and bypasses with a race-cat and threadolets welded in , and the euro wiring harness to connect the sensors .

Maybe a project for a future car ...

[chipmunk]

Thanks edc. I was going to crawl under the car today and check - saved me a job. Looks like I will only be buying the cat back box afterall. Think I might do the Crios mod on the tail pipes in the meantime - seems to provide some good results from what I have read

[clickman]

Any before/after videos or sound clips so we can see what they're like?

[edc]

Originally Posted by chipmunk

Thanks edc. I was going to crawl under the car today and check - saved me a job. Looks like I will only be buying the cat back box afterall. Think I might do the Crios mod on the tail pipes in the meantime - seems to provide some good results from what I have read

Try the CRIOS first perhaps. Depending on how loud you like it you might not like the silencer on its own. The US guys on here effectively have another set of cats to dampen the sound. My recommendation for your UK car would be to do the silencer and manifolds together. The sound is better and so is the power.

The other thing to consider is a balance pipe between the 2 boxes.

[chipmunk]

edc - are you saying that using the Top Speed catback box may be a bit loud due to not having the second cat? I had thought about replacing the branches as a full system will always provide better performance but had been put off by the cost. The Fabspeed seems quite popular but from what I can see that will set you back a couple of thousand pounds. Hence my interest in something like the Top Speed catback. I did check whether they also supplied branches but from what I could see they didn’t for a 986.

Why do you need a balance pipe between the boxes? I assume here you mean the two separate boxes that the Top Speed catback unit has?

I see from your signature that you have a stainless steel exhaust and manifold – what did you fit?

[edc]

chipmunk - have a look here Tuned/modified 2000 Boxster S or on boxa.net http://www.boxa.net/forum/index.php?showtopic=53075

[jrcui]

Just put mine on today. Everything came off easy, but putting on the driver's side delete pipe took a bit of fiddling till I finally got everything to line up. Pax side was 10 times easier. I'm a super novice, so if I can do it anyone can. Only drive a few miles but feels like she's breathing easier and the growl comes on sooner. Guys at Topspeed were great at shipping it quickly and responding to emails.

[OHBoxsterS]

Originally Posted by jrcui

Just put mine on today. Everything came off easy, but putting on the driver's side delete pipe took a bit of fiddling till I finally got everything to line up. Pax side was 10 times easier. I'm a super novice, so if I can do it anyone can. Only drive a few miles but feels like she's breathing easier and the growl comes on sooner. Guys at Topspeed were great at shipping it quickly and responding to emails.

Any "drone" around 3000 rpm...?

[jrcui]

I've only put a few miles on it. Did a short drive on the freeway and didn't hear any drone. It isn't very loud when you're cruising, but makes my NHP sound more aggressive when I stomp down. I am one of those that like it loud. My Durango sounds like a NASCAR.

[Paseb]

i just did a custom straight pipe from headers

i kept the headers cats, the rest is a straight exhaust...

hopefully, it wont be too loud..

db limit is 92 db,