3" exhaust questions

[smudge]

Originally Posted by Kodename47

You might find that the Borla is in fact the issue and getting a good manifold will sort it out. You want a good merge collector and the right runners and I bet that running a quality 2.5" system won't hold you back. 3" is really for those running a turbo and will be a PITA daily unless you silence it alot, in which case a freer flowing 2.5-2.75" with less silencing might be the optimal solution.

If standard manifolds aren't up to your requirement you could always get a custom one made that will be optimal for an/your SC application.

Why have you made 3 different suggestions on 3 different forums

Manifold is definitely worth a look, but how am I to know which is best when I have a stock catback in place of my damaged Invidia?

[Kodename47]

Originally Posted by smudge

Why have you made 3 different suggestions on 3 different forums

Manifold is definitely worth a look, but how am I to know which is best when I have a stock catback in place of my damaged Invidia?

Because I like to be confusing

If you want me to be concise then I'll say this: Manifold is more important than a larger bore exhaust. If you want to go completely custom and need a decent exhaust then speak to H&S about a complete package, they are probably the best to give advice design on the basis that they make exhausts for all types of vehicles and have already made manifold and exhausts for the FA20.

The next option is selecting the best off the shelf components or having a mixture of the two.

[thunderlights]

I have the nameless 3 inch catback and its simply amazing. Quality and fit and finish is simply the best on the market, and it has the most refined sound for a setup like mine. Im currently all stock header and fp/op with the no muffler option and its loud, but doesnt sound nearly as annoying as the tomei exhausts i hear locally. They also make a 1 peice fp/op in 3 inch that will flow better than two peice options.

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[fika84]

Originally Posted by thunderlights

I have the nameless 3 inch catback and its simply amazing. Quality and fit and finish is simply the best on the market, and it has the most refined sound for a setup like mine. Im currently all stock header and fp/op with the no muffler option and its loud, but doesnt sound nearly as annoying as the tomei exhausts i hear locally. They also make a 1 peice fp/op in 3 inch that will flow better than two peice options.

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Your catback has no comparison to a full exhaust with built engine and supercharger...... Why did you feel the need to post this?

[thunderlights]

Originally Posted by fika84

Your catback has no comparison to a full exhaust with built engine and supercharger...... Why did you feel the need to post this?

Um because its a thread asking about 3 inch exhausts? Does that not make sense to you?

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[Jesse@JDLAutodesign]

We can do 3" with your preference of tip style etc.






You're probably best going to a local fabricator for a 3" overpipe/frontpipe. Clearance is very tight with RHD...I know ours won't work.

[Fastbrew]

Just to throw this in -

I have a Perrin 3" in the back but I am AVO 2.5 up front. I have an AVO turbo and run E85/Flex getting 350WHP on 10.5 pounds of boost. We can get even more HP out of it before considering a new fuel pump or the air flow. I was glad NOT to have to go 3" up front or do the fuel pump to achieve this goal.

Just pointing this out so you can consider it with your long term goals.

[BRZoomTX]

Originally Posted by smudge

For those that don't know, I'm not stock

I'm on a built motor running the Sprintex 335 kit. Currently running her in and we're already seeing 1.2bar of boost at just 5500revs

Unless you're making north of 400whp you really don't need 3".

[DAEMANO]

@smudge

I split the difference btwn 2.5" and 3.0" and upgraded to an Ultimate Racing 2.75" Overpipe and Frontpipe combo (resonated catless). I also run 2.5" CNT catless UEL and TRD USA Catback. The OP/FP make an additional zero WHP and 7 more WTQ on my Phantom ESC at 5 psi (roughly equivalent to 7-9pst SC/Turbo) than another Phantom ESC owner running just a stock Header, OP and a 2.5" High-flow cat Frontpipe (both dyno'd, but on different dynos and days). I'm currently at 223 WHP/207 WTQ.

The OP/FP sounds more bassy and quite a bit louder (which I like, but is not for everyone). A 3" setup would probably net the same. My recommendation would be to save your money unless you really want more sound and just a tad more power.

[smudge]

Heading down to a fabrication shop this weekend. These guys made up the custom centre section on my old exhaust and really know their stuff. Hopefully a custom UEL manifold to catback won't be too expensive...

[smudge]

Quoted £2000 (about $3500) for a full manifold to catback...ouch

Back to square one

[smudge]

So, I've gone for the Ultimate Racing 3" catback and I'm in the process of deciding on the manifold, overpipe and front pipe

I think the AVO 3" front pipe and overpipe combination is a good shout for the money, but the OP will need modifying to fit the same way the OEM one would as it's designed for the turbo manifold obviously. I think the AVO 3" OP and front pipe paired with a custom manifold may be my best option here

[rmak321]

I'm currently running the Nameless catless header and 3" header-back exhaust (overpipe included). Even with my plans to add a SC in the near future I'm swapping the exhaust for the Nameless 2.5" cat-back mainly due to noise. The 3" isn't really necessary unless you're building a racecar. NA it's super, SUPER loud... a turbo would quiet it but SC won't.

[smudge]

Originally Posted by rmak321

I'm currently running the Nameless catless header and 3" header-back exhaust (overpipe included). Even with my plans to add a SC in the near future I'm swapping the exhaust for the Nameless 2.5" cat-back mainly due to noise. The 3" isn't really necessary unless you're building a racecar. NA it's super, SUPER loud... a turbo would quiet it but SC won't.

I'm used to loud so it's OK. Although I am tempted to get the AVO 3" front pipe with the 5" high flow cat just to keep it a bit tame for track days