172 Cup OEM+

PerthRS · Sep 28, 2025

From what I've read. With the right combination (197cams+7-8 inlet advance or Grp-N timing on standard cams) RS2's tend to sacrifice the peak torque figure, but will flatten and extended the torque over a much wider range.
Typically a standard f4r 730-738 makes peak torque around 5000-5300rpm. An RS2 equipped unit will make close to peak torque from 2500 to 6500. Though this is probably tuner dependent.

It is also advised to change out to 197/200 or 225 injectors due to duty cycle limitations on standard units.
ARP rod bolts definitely wouldn't hurt either.

I've heard the RS2 doesn't agree well with some off the shelf cams. As the inlet was designed to maximise the internally standard engine.

Got a RS2 sitting in the garage waiting in the wind. So would like to hear from people and their past experiences.

bowen86 · Sep 29, 2025

Put in some time this weekend on the JMS Inlet.

The manifold looked like it was painted with a brush, so I started to strip it.

Under the thick black was thick red. FML.

It beat me and I've dropped it for vapor blasting.

The aluminium which was anodised blue, which isn't the worst colour considering the colour of the car, but it wasn't for me.

@frayz came through with the great idea of applying some bleach to remove the colour.

Voila

Trumpet panel had the same treatment.

Needs more work, but you get the idea.

In terms of what's needed or what I plan to add with the RS2 inlet. I'm in conversation with James who made and has the RS inlet on his Clio. At the very minimum a 182 Manifold and map.

Ben perry · Oct 5, 2025

Wow what a road trip mate nice write up as said befor I miss my cup would love another 😂🫣

bowen86 · Oct 5, 2025

Ben perry said:
Wow what a road trip mate nice write up as said befor I miss my cup would love another 😂🫣

Thank you mate. It's so hard to explain the awe of the place, pictures don't do it justice and nor do my words.

Planning for next year already.

bowen86 · Oct 5, 2025

Bit of an update.

Pre vapour blasting.

And done...

Then I spent a few hours yesterday plumbing it all in. There are no fitting guides out there, that I could find anyway, and although pretty straight forward the vac line to brake booster had me stumped for a little bit. Also, the bolts on the bottom of the inlet... What the actual f**k. Dislocated my wrists getting them done.

And fitted.

Few bits need tidying where I've had to free wires from conduit etc.

Apart from starting it and letting it idle, I've not driven it and won't REALLY drive it until it's ready for mapping.

bowen86 · Tuesday at 10:08 PM

Gathering some parts to get the most out of the RS2 inlet.

First part, a 182 exhaust manifold which I've bought from @Louis it has a V band flange welded on the end, which I think will make it easier.

My question is "how do I get this to connect up to a 172 exhaust?"

My current exhaust is a Klarius(?) system which is a repo of a standard exhaust, as I was done with the drone from the KTEC resonated exhaust.

I'm thinking I need a sports cat/decat which has a vband at one end and a 'normal' flange at the other like this?

Send help.

Matt Cup · Tuesday at 10:10 PM

Buy a 182 cat and get an exhaust firm to fab it up.

neil a · Tuesday at 11:01 PM

I use to run a 172 -182 conversion sports cat that I then had converted to V band saved chopping the 172 system

PerthRS · Wednesday at 4:07 AM

bowen86 said:
My question is "how do I get this to connect up to a 172 exhaust?"

Seems like K-Tec make/supply a 182 manifold to 172 backbox pipe with catalyst.
Link: https://k-tecracing.com/products/kt...Kp0MwKX7WsKz_FHqs3FqY82040QLgU9O76pwi22b8fq9v

bowen86 · Wednesday at 7:48 AM

PerthRS said:
Seems like K-Tec make/supply a 182 manifold to 172 backbox pipe with catalyst.
Link: https://k-tecracing.com/products/kt...Kp0MwKX7WsKz_FHqs3FqY82040QLgU9O76pwi22b8fq9v

Other than the eye watering cost, I'd need to chop one end to make a vband. 😢

bowen86 · Wednesday at 7:49 AM

Matt Cup said:
Buy a 182 cat and get an exhaust firm to fab it up.

Seems like a good idea.

Louis · Wednesday at 9:00 AM

Whatever you have in there you'll need a flexi to counteract the solid joint.

bowen86 · Wednesday at 9:22 AM

Louis said:
Whatever you have in there you'll need a flexi to counteract the solid joint.

Where the manifold joins the cat/decat?

Louis · Wednesday at 9:24 AM

bowen86 said:
Where the manifold joins the cat/decat?

Anywhere along the exhaust system. I ran a vband, flexi, cat, vband on mine.

bowen86 · Wednesday at 9:28 AM

I need pictures brother.

Brigsy · Wednesday at 4:26 PM

Id bin the klarius exhaust for something a bit more free flowing and get an exhaust place to extend the centre pipe to manifold with a flexipipe and vband, so only one joint.

MAXRUNDOWN · 2025-10-23T13:19:52+0100

I'd ditch the pattern exhaust and get a fab shop to make something to fit, you can still have something quiet with a couple of decent boxes in it if that's your thing.

I've heard nothing but bad things about the Ktec cats too, they're cheap china rubbish that probably won't get you through a legit MOT

I had a magnaflow sports cat welded into my milltek downpipe, it was a while ago but I think the lad that does my fab work only charged me £40 to do it.

This is the cat I went with

Little Newms · 2025-10-23T19:47:51+0100

This sounds like a lot of effort Bowen... I'll help you. Just sell me the RS2 👍🏻

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