Fast Intentions exhaust is here! (continued)

V1H

Yes I'm new here

Yes I've already heard Turbos quieten the car down, but that cannot be a reason for not going turbo. That's why I'll choose non-resonated X-pipe and non-resonated downpipes

Regarding 3", I was explained 3" is good for Turbo setups that go beyond stock motor capabilities. And that 2.5" and 2.75" are sufiicient, i.e. no bottle neck, for the GTM MHI TT kit.
Apart from that, I ever only found their 2.5" TDX offered on F.I. web page, not any 3" version. But more importantly, I needa keep cats for emissions and FI only offers 3" test pipes as downpipes, yet 2.5" HFC downpipes

Hence, 2.5"

genesis2012

AHHHHhHhhh!!!!!

It hasn't even been a week yet since I've placed the order!!

I want the exhaust now!! I am part of the Gen Y so It is all about me me me, now now now!

Jk, I do hope I get my exhaust in 5 weeks !! Probably not but it would be nice *hint hint @ FI

I can't wait!

F.I. Inc.

I ask that you be patient. Your lead time is 6-8 weeks from when you placed your order. We always do our best to build and ship on time and sometimes early.

Thank you, Tony

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Phone: (805) 522-FAST (3278)
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F.I. Inc.

Our 3" exhaust will be a great fit for your TT application regardless if you have a stock engine or built. The 3" will help relieve all pressure on the back side of the turbo increasing exhaust velocity and allowing the turbo's to spool faster. Sure, 2.5" will work just fine, especially for the over level you plan on being at.

We do have a full 3" setup. I have sold almost 2 dozen, but never got around to putting it up on our website. It will be on the new website which should be launched shortly. For now, here is a link to our 3" exhaust thread:

Fast Intentions 3" (Twin Turbo) exhaust is here!

Thanks, Tony

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Phone: (805) 522-FAST (3278)
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V1H

Hi Tony, thanks for your helpful explanations.
I still have some questions.
I notice a distinctive design difference between your 2.5" and 3" TDX.
The 3" seems to use 3" TP in place of the downpipes, with the catalysers (100cell) now moved downstream into the lead pipes. On the 2.5" the cats still sit in the downpipes (factory positions), the lead pipes are thus straight (or resonated).

I wonder why the cats moved into the lead pipes. Is it just more temperature-friendly? And since the 3" uses testpipes only, does the O2 bung extension on the TPs still prevent CEL?

I'd be all up for going 3", not 2.5" if the only difference is better Turbo spool.
Any sound differences considering both non-resonated?

Most importantly I still wonder whether the 100cell cats pass M.O.T. here in the U.K.
Problem is I don't know how modern cars are emission tested (I've had an OBD1 Prelude before) and my Z is still too new for M.O.T
Do they actually sniff the emissions on the tailpipe (then the 100cells would surely fail?) or does the ECU merely give a pass/fail in which case one could trick the ECU into satisfaction?

F.I. Inc.

Don't mention it!

There is no difference in design between the 2.5" and 3" versions. The 2.5" version can also have a full down pipe starting at the exhaust side of the turbo. What we do is start the down pipe in 3" and than smoothly taper it down to 2.5". You can run the 100 cell cats in either system. They are moved down further in the exhaust stream to reduce the amount of heat that they will see. They will hold up much better in that location and being that they are 100 cell, they will do very little to hinder performance. Mainly they quiet down the exhaust note and help reduce the raw fuel smell coming from the tail pipes.

It is a safe bet to say that these cats will not pas your M.O.T. inspection considering that they are a race cat.

The "J" bend anti foulers are in place to trick out the ECU and keep the CEL off.

In the end, the 3" will be the way to go if you want to maximize turbo spool and reduce restriction. Achieving that zero psi back pressure on the exhaust side is imperative to maximizing performance.

Think that this covers it for now.

Thanks, Tony

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Phone: (805) 522-FAST (3278)
Email: tony@fastintentions.com
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V1H

Yes I think Tony is saying you could run the 2.5" TDX with the 100 cell cats placed in the lead pipes just like the 3" does. You'd have to select the 3" downpipe though. The 2.5" downpipes only come cat'ed (300 cell).

Ok, as much as I'd like to maximize performance, I'd have to go with the 2.5" then, in order to keep the 300 cell cats for M.O.T.
Either way, it's gonna be a sweet exhaust with stunning looks

Cheers

YzGyz

Hummm, I'm a little lost as I'm a F I noob. The kit I was looking at was Boosted Performance since out was made comparable with the TDX 2.5". I think that kit uses the stock "down pipe"?? .. Ahh I don't know what I'm talking about.... Summertime full me in please.

YzGyz

Hummm, I'm a little lost as I'm a F I noob. The kit I was looking at was Boosted Performance since out was made comparable with the TDX 2.5". I think that kit uses the stock "down pipe"?? .. Ahh I don't know what I'm talking about.... Somebody fill me in please.