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Challenge USA F30 335 – Exhaust and Downpipe

Challenge USA 2012 BMW 335 exhaust system

As a follow up to our general product development we have been testing our catback for the F30 335 over the past week. We are playing with some different canisters to get the right amount of sporty sound with no droning or excessive noise. The exhaust will used full 3in piping front to rear ( the OEM pinches down to 2.5in in the front areas) with a dual outlet canister and 3.5in exhaust tips Once we add the catless downpipe, it’ll add some more aggressive sound as well as a good bump in power im sure

Here are a few shots we took the other day once the weather cleared up a bit. We’ll take some more shots of the exhaust once we have a more finalized version to show.

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Challenge – F30 335 / 328 Product Development Begins!

Challenge BMW F30 335

CHALLENGE – F30 335 / 328 Product Development Begins!

Over the weekend we started to tear into our F30 335i sport to see what improvements we can make to the cars power train and other mechanical systems. Naturally, we got her up on a lift so we can give the car a good look over to see what stands out as needing improvement over the stock equipment. We plan on offering a full line of performance and cosmetic enhancements for both the F30 335 and 328i models, with some parts crossing over between the 2 models. F30 M sport and M3 parts will of course follow once the car is released. We took a handful of photos so you guys can see what your new car looks like and have a reference to what we’ll be developing moving forward.Exhaust and Down Pipe ( Cat )The factory exhaust is actually already a full 3inch unit minus a few small areas where its pinched down a bit here and there. The main restriction point is the rear canister it would seem. The valve system on the canister also help keep it on the quiet side and restricts flow for most of the low to mid RPM range. New on the F30 is the valve system, is now electronic. The previous was a vacuum based system. A bottle style resonator is also used in the mid pipe for keeping sound in check

First F30 335i (N55) Dyno Results Are In

We bring you the first dyno results from a 2012 335i (F30) sedan, performed by Challenge Mfg. USA (GTM_Challenge) on their recently delivered 335i. The F30 335i is powered by the N55 6-cylinder TwinPower twinscroll turbo engine and its factory quoted power figures are 300hp / 300lb-ft.

The 335i N55 dyno run resulted in 270whp and 273lb-ft torque. Note that the dyno was performed on a AWD Dynojet with linked AWD rollers. On a normal rear-roller-only system the numbers would be slightly higher (probably 5-10hp) given the less roller weight that would need to be moved.

What does this translate to in terms of crank HP (for comparison to the factory quoted figures)? Taking 275whp and 278lb-ft as the starting point and assuming a 15% drivetrain loss, it would mean that this 335i outputted approximately 324hp / 327lb-ft torque at the crank (or +24hp / +27lb-ft over the factory quoted numbers).

Like the F30 328i with its N20 engine (dyno results), it’s safe to say that the F30 335i and its N55 engine are also underrated from the factory (no surprise).

Check out the dyno run video and graph below.

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