PPI is proud to announce our patent pending injector bore repair kit for BMW engines.

Please make sure to use the drop down menu and select your correct engine or we will ship a N54 kit by default. It is a different repair sleeve for each engine and a N55 kit will not interchange with a N54 kit.

We have also added a repair shop starter kit as many of you shop owners have asked for. It will come with 16 sleeves and covers all engines listed in the drop down menu.

Kits include only the following, correct drill bit, correct tap matched to our sleeve, repair sleeves, drill guide, and an air hose to blow out combustion chamber to ensure no shavings made its way into the cylinder and if so, this will blow them out.

A customer made a nice DIY video which can be found here.

https://youtu.be/ajzUH0b71gQ

Disclaimer: this kit is to be used to fix a ovaled or worn out injector bore in the head as a chance to keep from having to replace the engine or cylinder head. This kit involves drilling and tapping the injector bore hole. By installing this kit you do so at your own risk. If you are not comfortable doing this we strongly advise having a shop do this. It is typically 1-2 hours labor time.

This item will have no warranty. As it is a repair kit that the end user installs, we give no warranty. Use at your own risk. It is to be used as a last resort to keep you from having to replace your cylinder head from a damaged injector bore. PPI makes no warranty on the product and are not responsible for improper install or damage to vehicle or body. Use at your own risk.

11 Reviews Hide Reviews Show Reviews

5
Ppi injector bore fix

Posted by Cobie on Jul 13th 2025

First I am super happy with how the customer service is handled, i was able to get ahold of them very quickly to make sure they were in stock at the time. Second it was able to fix my low compression readings on my new to me motor due to compression leaking out of the injector bore. Last its also seems like it would be a really nice and clean looking solution for DI delete as well. All in all super happy with the kit, definitely will be purchasing more sleeves now that i have the tools to do it for my spare motor as well.
5
Injector bore repair kit

Posted by Bosley's Euro Automotive on Feb 2nd 2024

I've never met Michael Hollingsworth and don't know the gentleman. I did read a negative review which made me skeptical. However, my first transaction experience with PPI is deserving of 5 stars! This injector bore repair kit saved the day and saved my customer thousands on his N55 E92. I do recommend PPI and will do business again! Thanks again to you Mr. Michael Hollingsworth!
5
N54 bore kit

Posted by Dusty Cornett on Jul 27th 2023

Worked awesome, great communication with ppi. Would definitely recommend for anyone with loose injectors.
5
Injector bore repair kit

Posted by Talon Hart on May 19th 2023

Saved my head from heading to come out like the description said! I followed the direction from Jake Spence in the video listed here and it went very smooth. I was nervous about the process but the supplies were top notch and made it very safe in my opinion. Thanks PPI!!!
5
Easy to use solved misfires.

Posted by Devan Hixson on Mar 3rd 2022

Easy to use install took about 3 hours and it solved a persistent misfire that would not go away on f10 535i
5
Injector bore repair kit

Posted by Bobby Jovanovski on Feb 11th 2022

This kit saved my car. It absolutely works
5
PPI injector Bore Kit

Posted by Donald Fitzgerald on Jan 2nd 2022

Special thanks to you guys for the kit. My #6 injector hole was so badly oblong shaped that no matter what I tried i could not get the injector to seal at all. This kit saved me from having to buy another engine or having to replace the head. The kit works 100%. I tried all the tricks with the Teflon tape but nothing works like this kit does. I couldn't believe how lose the injector bore was until I put the new sleeve in. The precision of the sleeve to fit the injector is incredible. I am very satisfied with this product. Thank u very much
5
Ridiculously Easy

Posted by Stella & Nicole on Dec 12th 2021

Let’s start off by saying just how sketched I was when hearing I’d have to drill in my engine. I was not very hopeful and that’s the truth. But, I listened to Michael and took his word for it. We repaired ALL 6 of my injector bores. I knew a few of them were bad just because of the way the injector would come out but since we were there, we just knocked them all out. I have never felt my car as healthy as she is. Compression is extremely good and I haven’t had a misfire since this fix. I know it might sound a little off-putting but have faith! It works!
5
Quick and Easy Fix For an Expensive Problem

Posted by Jacob J on Dec 12th 2021

*Update* When checking for a no start issue this week, I had a hair up my ass and checked compression. My numbers are as follows after the injector bore fix Cylinder compression 1. 175 2. 175 3. 175 4. 180 5. 170 6. 175 After struggling with misfires for the past three weeks I finally narrowed my issue down to injector bore being ovaled out on cylinder 5. When I looked for answers I came across a kit put together by ppifpr.com that is basically a stainless steel timesert to fix the injector bore and keep a tight seal on the injector. The whole process is very simple, I have previous experience with timeserts but was weary of metal shavings in my engine. A few hours later all 6 of my injector bores have been fixed and I finally made a full pull without misfiring. Thanks ppifpr.com y’all just saved me big time! Now back to picking on mustangs.