SROC276

Ok for you blown cs out there.....I was advised s2 would not be advisable on a car with factory primary cats because of back pressure which may damage the engine? In all my years or modifying cars I've never heard of this would like solid feedback. Iam looking between the weistec s1 and or the s2. I am running shorty headers into stock primaries then free flow full exhaust. As s1 and s2 are the same with boost being the main difference and tune...anyone else have any input as to why I couldn't slap on a s2 for the same price as an s1?

Sincity

PLM still make those shorties?

Merc63

Ask weistec they know their products best.

S1 is a waste of money, you need S2 to make it worth it IMO.

SROC276

Yes they still make them...i had mine ceramic coated black

SROC276

Thats what i thought. Weistec told me s1 better for my application and s2 wont work due to back pressure issue. S2 designed for cars with long tubes basically. Any thoughts on this? I would assume tune for s2 runs catless and that would be main difference but i was told differently that backpressure can cause issues if i strap on a s2 with my set up.

Merc63

You need a free flowing exhaust for S2. Shorties and cats isn't much better than stock.

SROC276

True so was thinking its more tune route and nothing mechanical per se

Guilty

I mean if you're spending that kind of money on a SC, you might as well do it right ^^

average joe

I am running weistec S1 (634bhp) and to go S2 requires Long Tube Headers and a free flow exhaust. The pulley is changed and a re-map. It costs as far as I am aware roughly 900 dollars to upgrade from S1 to S2.

SROC276

Yes I think it is more a factor of the tune to handle more boost and maximize with the long tube set up. I am assuming they dont have a custom tune to run s2 without long tubes is basically what I am saying. Ok thank you all for the feedback...

EkS

I would ditch those shorty headers and get some long tubes and step up to the S2. You will NOT be disappointed, trust me!

https://mbworld.org/forums/c63-amg-w...10-7-pass.html

SROC276

I came from long tubes and it was way too loud for me and the exhaust smell was over powering sitting in the traffic. I went back to stock primaries but used PLM to improve flow and not sacrifice too much vs. stock. I am thinking if I wanted S2 I will need a custom tune to run with the primary cat still in which could be way expensive.

Maverick1975

Maybe I am missing something here but why not get sports cats in place of primaries

mr747

Andrew just put some headers on and supercharge that puppy

roadtalontsi

ya stage 1 and 2 are really just a blower pulley change and tune. get high flow cats. I've seen most of the shorty 63 headers and they are marginally better than stock at best. If you have a quality muffler it wont be loud at all you just have to spend some $$$. even stage 1 is worth it though. people get caught up in the peak numbers way tooooo much. Have you ever driven a 55k car like e55/s55/sl55/cl55 etc... go drive/ride in one. then imagine combining your 63 motor and that one. Instant 500tq off idle and even more top end power than stock. Everyone thinks stock 63 motors are torquey which is kind of sad. go experience a blown 63, 55k motor or better yet a biturbo v12 that is some crazy torque. not to say a c63 has to work hard to pass other cars or accelerate hard but the blower makes it effortless. I'll try and get some in car videos so people can get a good idea of how different it really is. I can smoke most people in any gear at 1500-2krpm try doing that n/a 63 style :/

C63-AMG

Next time I pass through DFW I'll have to check yours out. Seen the vids on Youtube and it looks insane.
This is a good topic b/c I am looking at going stage 2/3 at some point this year.

Weistec

THE PLM header is a factory replacement that is designed to bolt onto the factory mid pipes. Although the inner diameter is slightly larger than OEM manifold, it is still under 2.25" exit size. The most reputable long tube headers in the market have a 3.0" exit which is much larger and virtually un-restrictive for these power levels.

A factory manifold or even a PLM header is a bottle neck in airflow and this is why the Stage 2 system will not run well with these headers. It will create serious back pressure in the cylinder (pressure creates heat) and will eventually damage engine internals.

A long tube header on the other hand can flow at a much higher rate and therefore allow heat and pressure to evacuate out of the exhaust, allowing us to spin the blower faster and create more power.

In terms of boost, the Stage 2 system with a proper long tube exhaust only makes about 1-2 psi more than our Stage 1 system with stock exhaust, but the increase in airflow is significant and this is where you see big gains in power and torque.

We hope this explains this topic a little more in detail. Thank you.

Weistec Engineering

SROC276

You want to sell my headers back to me? Haha....the mod bug woke up again...thought I was done...keep hearing this whining sound every where I go

SROC276

I thought about that and it maybe part of the next project.....if I run s1 it may not matter due to carb legal purposes.

mr747

a mate of mine is selling ipe headers and front pipes for 1700 but by the time it gets there it will be 2 much

just buy mbh headers and the supercharger kit and be done with it

SROC276

Yes it does, been in contact with your advisors already and appreciate the chime in.

SROC276

Just kidding no plans to go back to long tubes...headache from fumes still lingering here....pondering the blower....we shall see....can you get one first?

mr747

It's on the cards Andrew soon

NellyRod

Great explanation. Thank you for that. How does this play out with high flow cats? I have MBH headers with 200 cell cats and an x-pipe in place of secondaries. Would the stage 2 setup work fine?

roadtalontsi

yes this is what i am running currently.