Thiel cs2.4 upgrade to cs 2.4 se

Replace with the same? Why? The only ones that will wear out are the electrolytics in the coax shunt position. In my SEs, these are CYC and those might be the last I would use in an upgrade. Erse has an affordable 100 uF metal polypropylene. And if you’re gonna to replace anything else,  might as well put in something of higher quality than the OEM caps. 

Jim Thiel used Clarity SAs in the coax feeds and Tom Thiel is planning to use Clarity CSA (2 generations newer than SA) for most caps in his 2.4 beta upgrade. More info on the Thiel Owners thread.

Please pardon my ignorance. I thought it will lose its capacitance overtime.  That is why i  came out an idea to replace the old for new.
For changing to different brand of the capacitors, my worry is it will change the original character of the speaker.

Electrolytic caps (those 100 uF in a Thiel) will drift after, say, 15-20 years. But everything else should be good for even longer. As far as changing the character, yes, you can make the speaker sound even better by upgrading the quality of the passive parts. The OEM caps and resistors are far from top quality available, especially today. Thiels were built to a price point so that regilar people could afford them. They are really good but can be made even better by improving parts quality in the crossovers. Go read the Thiel Owners thread starting about February when Tom Thiel started posting.

Dear Beetlemania, 
I will take your advice to  scrutinize the thread suggested by you.
Thank you for the information.

Hi guys, i intend to get claritycap csa 10 ohm + 3.9ohm to replace the original caps 13ohm +1ohm and claritycap csa 10ohm +18ohm to replace 27ohm + 1ohm original caps. Do i need to change or remove any resistors? Any opion on this combination?