4 sentences

1. 这车改装了低音炮，声浪很强。

   zhè chē gǎi​zhuāng le dī​yīn​pào, shēng​làng hěn qiáng.

   This car has been modified with a subwoofer, and the sound is very powerful.

   Source: Dong Chinese Dictionary

2. 这辆旧车经过改装后，性能提高了不少。

   zhè liàng jiù chē jīng​guò gǎi​zhuāng hòu, xìng​néng tí​gāo le bù​shǎo.

   The performance of this old car improved significantly after being modified.

   Source: Dong Chinese Dictionary

3. 这些产品在出口前需要重新改装。

   zhè​xiē chǎn​pǐn zài chū​kǒu qián xū​yào chóng​xīn gǎi​zhuāng.

   These products need to be repackaged before they are exported.

   Source: Dong Chinese Dictionary

4. 他改装成一名服务员混进了会场。

   tā gǎi​zhuāng chéng yī míng fú​wù​yuán hùn​jìn le huì​chǎng.

   He disguised himself as a waiter to sneak into the venue.

   Source: Dong Chinese Dictionary