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I also have the Z4 springs and eibach front sway on the middle hole. I had it on the hardest setting for a few days but hard cornering made the outside tire hop/slide. Love it it where it is.

That's what I was hoping for too but don't know how they did it. I would love to see others try. Two other guys including the OP only got 610 max on E30 with FX-350 and stock injectors. Any more ethanol maxed them out. Maybe less ethanol and higher octane, I dunno.

Thanks for the update, and sorry for your issues! Hopefully you can get the needed info and see expected improvements. Sounds about the same power as their FX-350 and stock injectors, so any frustration is understandable.Thanks again and best of luck.

Any updates on the Spool HPFP and injector power increases? What have your thoughts been? TIA

Awesome, exactly what I was hoping to hear. Thanks!

Any improvement?

Thanks for the write up! Looking forward to the other thread.

Awesome man! Love watching your DI progress.

Good to know man, thanks.

Understood man. The cutout couldn't hurt but a bottleneck still exists. GL with the build!

Makes sense with the top-mount. I'm not sure what the ID of the entire DP is but it may be worth having a good exhaust guy modify the one you have to 3.5-4". I even have 2' of stainless 3.5" left over from my experiment if you could use it.

Gotcha, don't think it'll do much besides more noise. DAW can get you a 3.5" exit one for a decent price if you reach out to Shawn. Would be worth it in my opinion

If you have a full 3.5-4" DP that goes to a cutout, I can't see why spool and power wouldn't be improved over the restrictive exhaust although we will be guessing what the actual gains are without before/after testing. Remnant shows some great gains with thiers which gives us an idea.

It's my understanding that a couple of other guys didn't trim them and regretted it / cut them. We'd have to dig up the old z4 spring thread to find names.

There are a few full 3.5"+ exhausts out there if you end up going that route. I bought DAWs 3.5" exit catless DP and injen's 3.5" exhaust. Just cut the 3.15 connection end off the exhaust and used a long 3.5" clamp to connect them. Don't have a ton a data to share but was the best option for me.

Mine did not come with bumpstops but did have the "silencers" installed on the rear springs. I cut the bumpstops which sounded better than hitting them on a regular basis. Only minor negative is front camber is-2.1 unless I get camber plates but I'm really happy.

Eibach z4 euro springs are nice. They have a .8" drop front and back and I think the feel great on the car for street use.

Make sure you have 100 or so miles on the new springs. My Z4 springs dropped another 1/4" during that time and settled.

I went with the Z4 euro eibach springs with .8" drop and 275/30 front - 305/30 rear tires and think it's great around town. You could always go with a 35 series sidewall to get a little more clearance.

This is an interesting read. I've been fighting through this. I had 295/35 Cup 2s and 275/35 PSS on the car with TEs a few months ago and it was amazing. Went with 295/35 and then 305/30 Conti Sport 2 and 255/35 PSS (freebies) for the winter and it's 50/50 if the car is good or wants to take a...