Cat time

I am mulling FVD x-pipe 200 cell cats v flat six�s x-pipe cat. Both represent the same increase in hp/torque. Do x-pipes increase cabin noise? https://www.fvd.net/us-en/21011122/s...-mufflers.html https://lnengineering.com/products/p...nged-cats.html

I have the Flat 6 X-pipe. I didn't have any cabin noise increase. But it's a cab and already noisy. Very noticeable engine response improvement. This is the only X-pipe I've owned.

Thanks for the feedback! The Flat Six is made in the USA and appears to be a better value.

SOUL is coming out with one. Highly recommend checking them out before pulling the trigger!

FVD/MM makes excellent exhaust systems. At last years prices, i would buy mine all over again. But pricing is out of control this year, making Soul and FSI very attractive options.

I wasn't aware of SOUL until this thread. I will be watching for them. We're getting snow this week so she's going on jack stands with the CTEK trickle feeder connected under the cover and we'll be dreaming of Montana roads in 2026 over the winter. I'll figure out who I'm going with and shoot a note to Santa. The good news is everyone knows who Santa is at my house.

You Tube

Is it ok if I like the deeper tone of the crossover? /s Great comparison video. I like the price number - they're on sale for $2700. The power increase, although not mentioned appears to be in the same range at the cross over. Thank you very much for this video.

Soul Sport cats and FVD x-pipe are great. But the LN/FSI x-pipe is the best!

My car is currently at Slakker for a 3.9 build. I went with the competition crossovers from soul. I don�t have the car back yet to report however but, I do recall Brandon saying that the crossovers were what he recommended vs the xpipe. They used to go w the top gear but had trouble w their warranty and has been recommending the soul.

I never quite got my head around why x pipe so I pulled the trigger on cross overs from Soul @ $2750. The path of exhaust to tailpipe makes a bit more sense to me at my current level of ignorance.

Well said. My thought process was similar lol

Yeah, I have FVD 200 cell crossovers and havent figured out the advantages and disadvantages of 200 cell X pipes. If anybody knows, please share!

Here is the prompt I used in ChatGPT to find info on X-pipes: �Find a resource that discusses the effects on engine power when changing from a traditional exhaust to an exhaust with an X-pipe. Also include comments about the effectiveness across a range of rpm�s� its easier to list this than list the response. At the end, gpt asked for a specific engine. So I told it �specifically, the m96 engine used in the Porsche 996� it provided summaries of all the X-pipes that are in this discussion. Overall there are HP gains. Most reference 11-15 for 400hp base. Knowing what I know, the x-pipe is pretty cool. But, if you pair it with a set of headers, where both are designed for the engine, the result will be magical. I first bought the X-pipe from flat six. Which was noticeable change. Then I bought their headers. A huge change. Then I got it tuned for my engine. It was a back and forth with the tuner for him to dial it in. The results are magical. Sorry, long post.

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Thanks, its good stuff. How did the power delivery thru the rev range change when you added the FSI xpipe and then the FSI headers?

Power delivery has always been very smooth. The rebuild to 3.8L brought the mid-range torque up. The headers, x-pipe, and tune just pushed all the curves up. Just more of everything. The problem I now have is that the bottom end moves air so fast, the heads are limiting air flow! My MAF signal flattens at 6k RPM. It didn't do this before the headers and X-pipe. Next step is to open up the top end with heads and cams. Too bad the extra power will overload the stock pushrods.

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I am really liking what LN/FSI and Hoffman are doing with teaming up to get the configurations in a machine. Very interested in what you end up doing with the heads and cams.